Eta (disambiguation)

Look up eta or ETA in Wiktionary, the free dictionary.

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
• Event tree analysis, a logical modeling technique
• Hapticity, η
• Viscosity, a measure of a fluid's resistance to deformation

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 conversion or η-conversion, the idea of extensionality in lambda calculus