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Stationery item used for flat mail
An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional
Envelope
Change of sound over time
In sound and music, an envelope describes how a sound changes over time. For example, a piano key, when struck and held, creates a near-immediate initial
Envelope_(music)
Gift envelope containing cash
A red envelope, red packet, red pocket, lai see (Chinese: 利是; Cantonese Yale: laih sih), hongbao or ang pau (traditional Chinese: 紅包; simplified Chinese:
Red_envelope
In mathematics, the lower envelope or pointwise minimum of a finite set of functions is the pointwise minimum of the functions, the function whose value
Lower_envelope
Topics referred to by the same term
Look up envelope in Wiktionary, the free dictionary. An envelope is the paper container used to hold a letter being sent by post. Envelope may also refer
Envelope_(disambiguation)
Theorem in mathematics and economics
In mathematics and economics, the envelope theorem is a major result about the differentiability properties of the value function of a parameterized optimization
Envelope_theorem
Areas of Israel within 7 km of the Gaza Strip
The Gaza Envelope (Hebrew: עוטף עזה, Otef Aza) is a modern administrative and security term that has become the common designation for the area in southern
Gaza_Envelope
Constant envelope is achieved when a sinusoidal waveform reaches equilibrium in a specific system. This happens when negative feedback in a control system
Constant_envelope
Aerodynamic performance of an air or spacecraft
In aerodynamics, the flight envelope, service envelope, or performance envelope of an aircraft or spacecraft refers to the capabilities of a design in
Flight_envelope
Outermost layer of many types of the infectious agent
between host cells. Not all viruses have envelopes. A viral envelope protein or E protein is a protein in the envelope, which may be acquired by the capsid
Viral_envelope
Curve external to a family of curves in geometry
In geometry, an envelope of a planar family of curves is a curve that is tangent to each member of the family at some point, and these points of tangency
Envelope_(mathematics)
Mobile application developed by Tencent
WeChat red envelope (or WeChat red packet) is a mobile application developed by the Chinese technology company Tencent. The concept, also offered by its
WeChat_red_envelope
Communication support for autistic drivers
blue envelope is a set of written instructions meant to assist encounters between law enforcement and drivers on the autism spectrum. The envelope holds
Blue_envelope
American manufacturer of envelopes
Envelope Corporation was an American manufacturer of envelopes. National Envelope was founded in 1952 in New York, New York, as the New York Envelope
National_Envelope_Corporation
Concept in architectural and engineering practice
A building envelope or building enclosure is the physical separator between the conditioned and unconditioned environment of a building, including the
Building_envelope
In mechanical engineering, an envelope is a solid representing all positions which may be occupied by an object during its normal range of motion. Another
Envelope_(motion)
Electronic circuit
An envelope detector (sometimes called a peak detector) is an electronic circuit that takes a (relatively) high-frequency signal as input and outputs the
Envelope_detector
Topics referred to by the same term
A red envelope (or hóngbāo) is a monetary gift which is given during special occasions in Chinese and other East Asian societies. Red envelope may also
Red_envelope_(disambiguation)
Metaphor for a rough calculation
A back-of-the-envelope calculation is a rough calculation, typically jotted down on any available scrap of paper such as an envelope. It is more than a
Back-of-the-envelope calculation
Back-of-the-envelope_calculation
Nuclear membrane surrounding the nucleus in eukaryotic cells
The nuclear envelope, also known as the nuclear membrane, is made up of two lipid bilayer membranes that in eukaryotic cells surround the nucleus, which
Nuclear_envelope
Smooth curve outlining the extremes of an oscillating signal
In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. The envelope thus generalizes the concept of
Envelope_(waves)
Lighter-than-air aircraft
balloon is a lighter-than-air aircraft consisting of a bag, called an envelope, which contains heated air. Suspended beneath is a gondola or wicker basket
Hot_air_balloon
Puzzle in logic and mathematics
The two envelopes problem, also known as the exchange paradox, is a paradox in probability theory. It is of special interest in decision theory and for
Two_envelopes_problem
A Soleau envelope (French: enveloppe Soleau; named after its French originator, Eugène Soleau [fr]), is a sealed envelope which serves as legally recognized
Soleau_envelope
File folder designed to contain documents
inside without folding. As with the manila envelope, it is traditionally buff in color. The manila envelope, a close relative of the folder, often has
Manila_folder
Envelope tracking (ET) describes an approach to radio frequency (RF) amplifier design in which the power supply voltage applied to the RF power amplifier
Envelope_tracking
Electronic musical instrument
altered by components such as filters, which cut or boost frequencies; envelopes, which control articulation, or how notes begin and end; and low-frequency
Synthesizer
2025 Thai film
The Red Envelope (Thai: ซองแดงแต่งผี, RTGS: Sxng dæng tæng phi, lit. 'Red envelope for ghosts') is a 2025 Thai supernatural comedy mystery film co-written
The_Red_Envelope
Rewriting an email message sender address
original envelope address so that if a bounce does arrive, it can be forwarded along the reverse path, but this time with an empty envelope sender. While
Sender_Rewriting_Scheme
Type of postal envelope
A stamped envelope or postal stationery envelope (PSE) is an envelope with a printed or embossed indicium indicating the prepayment of postage. It is
Stamped_envelope
Common gas atmosphere of a binary star system
configuration is said to be in a common-envelope phase or undergoing common-envelope evolution. During a common-envelope phase, the embedded binary system is
Common_envelope
1997 studio album by Jimmie's Chicken Shack
Pushing the Salmanilla Envelope is an album by the American band Jimmie's Chicken Shack. It was released in 1997. The album sold more than 200,000 copies
Pushing the Salmanilla Envelope
Pushing_the_Salmanilla_Envelope
Malay adaptation of the Chinese red envelope custom
A green envelope or green packet (Malay: sampul hijau or sampul duit raya) is an Islamic adaptation of the Chinese red envelope custom. During the festival
Green_envelope
Postage-paid envelope for return service
self-addressed stamped envelope (SASE), stamped self-addressed envelope (SSAE), or stamped addressed envelope (SAE) is an envelope with the sender's name
Self-addressed stamped envelope
Self-addressed_stamped_envelope
Category theory
In mathematics the Karoubi envelope (or Cauchy completion or idempotent completion) of a category C is a classification of the idempotents of C, by means
Karoubi_envelope
Former film production and distribution unit owned by Netflix
Red Envelope Entertainment LLC (originally Netflix First) was a film production and distribution unit created by Netflix in 2006. The studio produced independent
Red_Envelope_Entertainment
Safety system in aircraft
Flight envelope protection is a human machine interface extension of an aircraft's control system that prevents the pilot of an aircraft from making control
Flight_envelope_protection
Sound frequency changes responsible for perceptions of loudness, pitch and timbre
Temporal envelope (ENV) and temporal fine structure (TFS) are changes in the amplitude and frequency of sound perceived by humans over time. These temporal
Temporal envelope and fine structure
Temporal_envelope_and_fine_structure
Passive solar building
A double envelope house is a passive solar house design which collects solar energy in a solarium and passively allows the warm air to circulate around
Double_envelope_house
Technical analysis indicator
Moving average envelope is a technical analysis indicator, showing lines above and below a moving average. The starting point is a simple or exponential
Moving_average_envelope
Mathematical optimization function
The Moreau envelope (or the Moreau-Yosida regularization) M f {\displaystyle M_{f}} of a proper lower semi-continuous convex function f {\displaystyle
Moreau_envelope
Envelope with clear area for recipient's name
A windowed envelope is a conventional envelope with a transparent (typically PET or BOPS Bi-oriented polystyrene plastic film) window to allow the recipient's
Windowed_envelope
Graphic design partnership
23 Envelope was the name given to the graphic design partnership of graphic designer Vaughan Oliver and photographer/filmmaker Nigel Grierson from 1980–1988
23_Envelope
Bribed journalism practice
In media ethics, brown envelope journalism (BEJ), or simply envelope journalism, is the practice of journalists accepting monetary or other incentives
Brown_envelope_journalism
Protective outer structure of bacterial cells
The cell envelope comprises the inner cell membrane and the cell wall of a bacterium. In gram-negative bacteria an outer membrane is also included. This
Cell_envelope
Method in theoretical optics
varying envelope approximation (SVEA, sometimes also called slowly varying asymmetric approximation or SVAA) is the assumption that the envelope of a forward-travelling
Slowly varying envelope approximation
Slowly_varying_envelope_approximation
Binary system consisting of a white dwarf and a main sequence star or a brown dwarf
A post-common-envelope binary (PCEB) or pre-cataclysmic variable is a binary system consisting of a white dwarf or hot subdwarf and a main-sequence star
Post-common-envelope_binary
The carrier-envelope phase (CEP) or carrier-envelope offset (CEO) phase is an important feature of an ultrashort laser pulse and gains significance with
Carrier-envelope_phase
2012 American film
Envelope is a 2012 American short film directed by Aleksey Nuzhnyy and stars Kevin Spacey. It is inspired by true events of Soviet publicist and writer
Envelope_(film)
2021 Chinese romantic comedy film by Li Kelong
Big Red Envelope (Chinese: 大红包) is a 2021 Chinese romantic comedy film written and directed by Li Kelong and starring Bao Bei'er, Clara Lee, Jia Bing,
Big_Red_Envelope
Paper wallets used by UK doctors
Lloyd George envelopes, named after the British former prime minister David Lloyd George, are paper wallets used by general practitioners in the United
Lloyd_George_envelope
Email address to which bounce messages are delivered
of them used universally, including return path, reverse path, envelope from, envelope sender, MAIL FROM, 5321-FROM, return address, From_, Errors-to
Bounce_address
Measure of radio transmission power
Peak envelope power (PEP) is the average power over a single radio frequency cycle at the crest of the modulation. PEP is normally considered the power
Peak_envelope_power
Used in stochastics and mathematical finance
Snell envelope, used in stochastics and mathematical finance, is the smallest supermartingale dominating a stochastic process. The Snell envelope is named
Snell_envelope
Electronic mailing technique
Variable envelope return path (VERP) is a technique used by some electronic mailing list software to enable automatic detection and removal of undeliverable
Variable_envelope_return_path
Range of movement of the mandible
Posselt's envelope of motion or Posselt's envelope of movement refers to the range of motion of the lower jaw bone, or mandible. This envelope was first
Posselt's_envelope_of_motion
Part of a star
A circumstellar envelope (CSE) is a part of a star that has a roughly spherical shape and is not gravitationally bound to the star core. Usually circumstellar
Circumstellar_envelope
Topics referred to by the same term
Stellar envelope may mean: The region of a star that transports energy from the stellar core to the stellar atmosphere Common envelope in a binary system
Stellar_envelope
Western States Envelope & Label is a wholesale envelope and label manufacturer for the printing, distributing, mailing, and office supply trades. Western
Western States Envelope & Label
Western_States_Envelope_&_Label
Supernova caused by a giant and compact star merging
Common envelope jets supernova (CEJSN) is a type of supernova, where the explosion is caused by the merger of a giant or supergiant star with a compact
Common envelope jets supernova
Common_envelope_jets_supernova
Fraudulent home-based job offer or business opportunity
home business rather than a job. Examples cited by regulators include envelope stuffing, craft assembly, vending-machine routes, medical-billing programs
Work-at-home_scheme
Outer proteinaceous layer outside the oocyte and egg
The insect vitelline envelope is the outer proteinaceous layer outside the oocyte and egg. The vitelline envelope, not being a cellular structure, is commonly
Vitelline_envelope
Entertainment genre
discipline, Keith's theatre managers would occasionally send out blue envelopes with orders to omit certain suggestive lines of songs and possible substitutions
Vaudeville
Major structure in coronaviruses
The envelope (E) protein is the smallest and least well-characterized of the four major structural proteins found in coronavirus virions. It is an integral
Coronavirus_envelope_protein
1999 EP by ¡All-Time Quarterback!
The Envelope Sessions is the second release from Ben Gibbard's solo project ¡All-Time Quarterback!. The tape was a limited release on Elsinor Records and
The_Envelope_Sessions
Basketball player selection
obtaining the first pick. Inside each of the envelopes was the logo of a non-playoff team. The team whose envelope was drawn first would get the first pick
1985_NBA_draft
Envelope with protective padding to protect items during shipping
A padded envelope, also known as a padded or cushioned mailer, or jiffy bag in the United Kingdom, is an envelope incorporating protective padding to protect
Padded_envelope
2010 studio album by Gerald Albright
Pushing the Envelope is the twelfth studio album by saxophonist Gerald Albright, released in 2010 on Heads Up Records. This album peaked at No. 6 on the
Pushing_the_Envelope_(album)
1971 Spanish film
The Green Envelope (Spanish:El sobre verde) is a 1971 Spanish musical comedy film directed by Rafael Gil and starring Tony Leblanc, Esperanza Roy and Guadalupe
The_Green_Envelope
Simple email-validation system designed to detect email spoofing
domain. This authentication only applies to the email sender listed in the "envelope from" field during the initial SMTP connection. If the email is bounced
Sender_Policy_Framework
stamped envelope (Russian: Художественный маркированный конверт) is a stamped envelope with an additional work of art on the face side of the envelope. каталог
Illustrated_stamped_envelope
Type of sideband modulation
CESSB (controlled-envelope single-sideband) is a narrowband modulation method using a single sideband, whose peak envelope level is controlled so that
Controlled-envelope single-sideband modulation
Controlled-envelope_single-sideband_modulation
Concept in cryptography
HTTP, Privacy Preserving Measurement, and TLS Encrypted Client Hello. Envelope encryption is an example of a usage of hybrid cryptosystems in cloud computing
Hybrid_cryptosystem
Lighter-than-air aircraft
wind, the lifting gas capsules are often protected by a more rigid outer envelope or an airframe, with other gasbags such as ballonets to help modulate buoyancy
Aerostat
Subfamily of viruses in the family Coronaviridae
caused a cold and was inactivated by ether which indicated it had a lipid envelope. Dorothy Hamre and John Procknow at the University of Chicago isolated
Coronavirus
Antibiotic
A cell envelope antibiotic is an antibacterial that acts primarily at the level of the cell envelope.[citation needed] Examples include cycloserine, penicillin
Cell_envelope_antibiotic
Envelope of light rays reflected or refracted by a curved surface/object
network is the envelope of light rays which have been reflected or refracted by a curved surface or object, or the projection of that envelope of rays on
Caustic_(optics)
In category theory and related fields of mathematics, an envelope is a construction that generalizes the operations of "exterior completion", like completion
Envelope_(category_theory)
1916 film by Wilfrid North
The Blue Envelope Mystery is a lost 1916 silent film drama directed by Wilfrid North and starring Lillian Walker. It was produced by the Vitagraph Company
The_Blue_Envelope_Mystery
Glycoprotein exposed on the surface of the HIV virus
Envelope glycoprotein GP120 (or gp120) is a glycoprotein exposed on the surface of the HIV envelope. It was discovered by Professors Tun-Hou Lee and Myron
Envelope_glycoprotein_GP120
Quality of a musical note or sound or tone
physical characteristics that govern timbre include frequency spectrum and envelope. Musicians can change timbre by modifying their singing or playing techniques
Timbre
Like mitochondria, chloroplasts have a double-membrane envelope, called the chloroplast envelope, but unlike mitochondria, chloroplasts also have internal
Chloroplast_membrane
Mathematics concept
In mathematics, and particularly convex analysis, the lower convex envelope f ˘ {\displaystyle {\breve {f}}} of a real-valued function f {\displaystyle
Lower_convex_envelope
Laser source with equal intervals of spectral lines
octave-spanning combs can be used to steer a piezoelectric mirror within a carrier–envelope phase-correcting feedback loop. Any mechanism by which the combs' two degrees
Frequency_comb
Statistic expressing the amount of random sampling error in a survey's results
The margin of error is a statistic expressing the amount of random sampling error in the results of a survey. The larger the margin of error, the less
Margin_of_error
Notion in abstract algebra
mathematics, particularly in algebra, the injective hull (or injective envelope) of a module is both the smallest injective module containing it and the
Injective_hull
Audio filter effect
effect is also known as a "Q-wah", "T-wah", "envelope following filter", "envelope follower" or "envelope filter". Instead of the effect being controlled
Auto-wah
Organelle in eukaryotic cells
nuclear envelope is impermeable to large molecules, nuclear pores are required to regulate nuclear transport of molecules across the envelope. The pores
Cell_nucleus
Form of a matrix storage
skyline matrix storage, or SKS, or a variable band matrix storage, or envelope storage scheme is a form of a sparse matrix storage format matrix that
Skyline_matrix
Protein family
Nesprins (nuclear envelope spectrin repeat proteins) are a family of proteins that are found primarily in the outer nuclear membrane, as well as other
Nesprin
Radar envelope is a critical Measure of Performance (MOP) identified in the Test and Evaluation Master Plan (TEMP). This is the volume of space where a
Envelope_(radar)
foreign viral envelope proteins. The result is a pseudotyped virus particle, also called a pseudovirus. With this method, the foreign viral envelope proteins
Pseudotyping
Mentalist envelope trick
envelope trick, is a mentalist effect in which a performer pretends to use clairvoyance to read messages on folded papers or inside sealed envelopes.
Billet_reading
Maximum dimensions for railway vehicles and their loads
between the two is called the clearance. The terms "dynamic envelope" or "kinematic envelope", which include factors such as suspension travel, overhang
Loading_gauge
Components of human immunodeficiency virus
since the discovery of the virus in 1983. Each virion comprises a viral envelope and associated matrix enclosing a capsid, which itself encloses two copies
Structure_and_genome_of_HIV
Binary star system whose component stars are very close
each other or have merged to share their gaseous envelopes. A binary system whose stars share an envelope may also be called an overcontact binary. The term
Contact_binary
19th-century postal stationery
Mulready stationery describes the postal stationery letter sheets and envelopes that were introduced as part of the British Post Office postal reforms
Mulready_stationery
Type of plane curve
centers on c {\displaystyle c} , and draw the envelope of these circles. Proof with envelope condition The envelope of the pencil of implicitly given curves
Cardioid
Type of paper made of wood fiber
manila paper has been shaped to create manila file folders and manila envelopes. It is just as strong as kraft paper but has better printing qualities
Manila_paper
Human retrovirus, cause of AIDS
the viral envelope. The envelope protein, encoded by the HIV env gene, allows the virus to attach to target cells and fuse the viral envelope with the
HIV
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