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Что (кто) такое π Χ $1$ - определение
STAR IN THE CONSTELLATION CYGNUS
Χ Cyg; Χ Cygni; Chi Cyg
![MM/DD/YY format]]](https://commons.wikimedia.org/wiki/Special:FilePath/Chi Cygni light curve.png?width=200 "MM/DD/YY format]]")
![Cygnus]] from [[Urania's Mirror]], with χ marked as variable](https://commons.wikimedia.org/wiki/Special:FilePath/Sidney Hall - Urania's Mirror - Lacerta, Cygnus, Lyra, Vulpecula and Anser.jpg?width=200 "Cygnus]] from [[Urania's Mirror]], with χ marked as variable")
Pi (letter)
![The earliest [[polyamory]] [[pride flag]] design, created by Jim Evans in 1995, in which the lowercase letter π stands for the first letter of polyamory.](https://commons.wikimedia.org/wiki/Special:FilePath/Polyamory Pride Flag.svg?width=200 "The earliest [[polyamory]] [[pride flag]] design, created by Jim Evans in 1995, in which the lowercase letter π stands for the first letter of polyamory.")
SIXTEENTH LETTER OF THE GREEK ALPHABET
Pomega; Pi (symbol); Pi letter; Π (letter); Variant pi; \pi; Πι; ℿ; Pi (Greek); Pi (Greek letter); Pi symbol; Var pi; Varpi
Pi (uppercase Π, lowercase π and ϖ; ) is the sixteenth letter of the Greek alphabet, representing the voiceless bilabial plosive . In the system of Greek numerals it has a value of 80.
Cation–pi interaction
![Fig. 2: The Stoddart synthesis of [2]catenane](https://commons.wikimedia.org/wiki/Special:FilePath/24 fig. 2.png?width=200 "Fig. 2: The Stoddart synthesis of [2]catenane")
![Cationic [[Acetylcholine]] binding to a [[tryptophan]] residue of the nicotinamide acetylcholine receptor via a cation–π effect.](https://commons.wikimedia.org/wiki/Special:FilePath/Acetylcholine-tryptophane cation-pi interaction.png?width=200 "Cationic [[Acetylcholine]] binding to a [[tryptophan]] residue of the nicotinamide acetylcholine receptor via a cation–π effect.")
![quadrupole]] charge distribution.](https://commons.wikimedia.org/wiki/Special:FilePath/Benzene Quadrupole.png?width=200 "quadrupole]] charge distribution.")
NONCOVALENT MOLECULAR INTERACTION BETWEEN THE FACE OF AN ELECTRON-RICH Π SYSTEM AND AN ADJACENT CATION; EXAMPLE OF NONCOVALENT BONDING BETWEEN A MONOPOLE (CATION) AND A QUADRUPOLE (Π SYSTEM)
Cation-pi interaction; Anion-pi interaction; Anion–pi interaction; Cation-π interaction; Cation–pi interaction
Cation–π interaction is a noncovalent molecular interaction between the face of an electron-rich π system (e.g.
Cation–π interaction
NONCOVALENT MOLECULAR INTERACTION BETWEEN THE FACE OF AN ELECTRON-RICH Π SYSTEM AND AN ADJACENT CATION; EXAMPLE OF NONCOVALENT BONDING BETWEEN A MONOPOLE (CATION) AND A QUADRUPOLE (Π SYSTEM)
Cation-pi interaction; Anion-pi interaction; Anion–pi interaction; Cation-π interaction; Cation–pi interaction
Cation–π interaction is a noncovalent molecular interaction between the face of an electron-rich π system (e.g.
Википедия
Chi Cygni
Chi Cygni (Latinised from χ Cygni) is a Mira variable star in the constellation Cygnus, and also an S-type star. It is around 500 light years away.
χ Cygni is an asymptotic giant branch star, a very cool and luminous red giant nearing the end of its life. It was discovered to be a variable star in 1686 and its apparent visual magnitude varies from as bright as 3.3 to as dim as 14.2, corresponding to a brightness factor of over 20,000. It is only visible to the naked eye for a short period near each maximum.
