Eta (Letter)

For other meanings of ETA, see ETA (disambig).

• In textual criticism, the Alexandrian text-type (from Hesychius, its once-supposed editor).

• In thermodynamics, the efficiency of a Carnot heat engine.

• In chemistry, the number of electrons shared between a metal center and a ligand in a coordination compound. For example, an allyl group can coordinate to palladium in the η¹ mode or the η³ mode.
• In physics, the refractive index of an optical medium (although the letter n is used when Greek symbols are unavailable).
• In Statistics, the Eta² is the "partial regression coefficient".

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