ENTROPY (DISAMBIGUATION)

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'Entropy' can have one of several meanings:
In 'science and technology':

★ Thermodynamic entropy, in science, the thermodynamic homogeneity of a system, limiting the ability to extract mechanical work.
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★ Introduction to entropy, an entry-level introduction
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★ Entropy (classical thermodynamics), macroscopic understanding of thermodynamic entropy
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★ Entropy (statistical thermodynamics), microscopic understanding of thermodynamic entropy
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★ Gibbs entropy, statistical entropy of a thermodynamic system
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★ von Neumann entropy, entropy of a quantum-mechanical system
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★ Boltzmann entropy formula, ''S'' = ''k'' ln ''W''

★ Information entropy (Shannon entropy), in statistics, the amount of information that is lacking in a random variable
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★ Entropy encoding, data compression strategies that set out to achieve message lengths close to the Shannon entropy
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★ Entropy (ecology), use of Shannon entropy as a measure of biodiversity in the study of ecology
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★ Renyi entropies, family of diversity measures generalising Shannon entropy; used to define fractal dimensions.
In 'mathematics':

★ Measure theoretic entropy, a measure of exponential growth in dynamical systems; equivalent to the rate of increase of Shannon entropy of a trajectory in trajectory-space.

★ Topological entropy , a measure of exponential growth in dynamical systems; equivalent to the rate of increase of α->0 Renyi entropy of a trajectory in trajectory-space.
In 'computing':

★ Entropy (anonymous data store), a computer network designed to be resistant to censorship

★ Entropy (PHP), a version of PHP compiled for Mac OS X
In 'literature':

★ ''Entropy'' (film), a 1999 film directed by Phil Joanou.

★ Entropy (board game), the name of two board games

★ a short story by Thomas Pynchon
In 'music':

★ ''Entropy'' (album), a split vinyl album by Anathallo and Javelins

★ Entropy ry., a student organization for electronic music at Helsinki University of Technology

★ a song on the album ''Against the Grain'' by Bad Religion

★ a song on the album ''Matter+Form'' by VNV Nation

★ a song on the ''b'' album by Moxy Früvous

★ a song by MC Hawking

★ Entropy, Hip-Hop Suite by DJ Shadow and the Groove Robbers.
In 'television':

★ "Entropy" (''Buffy'' episode), an episode of the TV series ''Buffy the Vampire Slayer''
In 'medicine':

★ Entropy (monitor) a monitor of anaesthetic depth using analysis of a 2 lead EEG.