Eta (disambiguation)

Eta (Η, η) is the seventh letter of the Greek alphabet.

Eta or ETA or eTA may also refer to:

Organisations

• ETA (separatist group), Euskadi Ta Askatasuna, Basque separatist group
• Electronic Travel Authority (Australia)
• Electronic Travel Authorization (Canada)
• ETA – Empresa de Transporte Aéreo, a defunct Brazilian Airline
• ETA SA, a Swiss watchmaking company
• ETA Systems, defunct manufacturer of ETA10 supercomputers
• Electronics Technicians Association International
• Employment and Training Administration, a branch of the US Department of Labor
• Engineering and Technology Academy, San Antonio, Texas, US
• Environmental Transport Association, British roadside assistance company
• Ethiopian Teachers' Association
• Evangelical Theological Association, former teaching institute, Melbourne, Australia

Science and technology

• Eta meson, in particle physics, a strongly interacting boson
• Dedekind eta function, a complex function defined in the upper plane
• Dirichlet eta function, an entire complex function
• Eicosatetraenoic acid, an omega-3 fatty acid
• Ethanolamine, a weak base
• Estimated time of arrival
• Event Tree Analysis, a logical modeling technique
• hapticity, η

Other uses

• Eta (given name), a feminine given name
• European Technical Assessment of the European Organisation for Technical Approvals for construction products
• Eta (glider), a German glider
• Eta, derogatory term for the Burakumin in the Japanese feudal era
• 'eta, a letter or glottal stop in the Tahitian languages
• Eta, a snack food brand owned by Griffin's Foods
• Estimated time of arrival, frequently abbreviated to ETA.
• ETA, an abbreviation for "edited to add", commonly used in internet forums.

See also

• Eta Carinae, a highly luminous hypergiant double star
• Eta conversion or η-conversion, the idea of extensionality in lambda calculus