Η

Eta in a capital letter Etymologicum Magnum (1499).

Eta (uppercase Η, lowercase η; Ancient Greek call ἦτα êta /ɛ̂ː.ta/, in modern Greek ήτα íta /ˈi.ta/) is the seventh letter of the Greek alphabet. Its pronunciation in ancient Greek was long e [e:], while in modern Greek it is pronounced [i] and is called ita (Ήτα). Its origin is the letter of the Phoenician alphabet ḥēt, and is in turn the origin of the Latin letter H and the Cyrillic letter И.

In the Greek numeral system it has a value of 8 (Η΄).

History

Epigraphic variants

In archaic epigraphic sources the following variants appear:

Use

• It is used in electrical engineering to indicate the performance of engines and transformers.
• It is used in Physics and Chemistry as a viscosity of a fluid or performance of a thermodynamic system.
• It is used in Statistics to indicate the power of a statistical test.
• It is used in electromagnetic fields to define the characteristic impedance of a material medium.
• It is used in Economics to indicate the elasticity of the cost of production.
• It is used in Cinematics to name the coordinate and the origin of a mobile plane regarding a fixed plane.
• In the Greek numeration system it has a value of 8 (Greenware).

Unicode

• Greek and Coptic

• Maths