Eta Symbol
About Eta Symbol
Η is the Eta Symbol, the seventh letter of the Greek alphabet in its uppercase form. Η denotes efficiency in engineering, dynamic viscosity in fluid mechanics, and the metric tensor in relativity.
【Pronunciation】 In English, Η is most often pronounced EE-tuh (IPA: /ˈiːtə/). This is simply the anglicized name of the Greek letter.
The uppercase Eta Symbol Η is written as a distinct capital Greek glyph and is assigned codepoint U+0397 in the Greek and Coptic Unicode block. In plain or sans-serif fonts it can be mistaken for the Latin letter H, so verify the typeface or context.
【Historical Origin】 Like every Greek letter, Η was adapted from a Phoenician consonant and entered mathematical and scientific notation through the work of ancient Greek scholars, remaining in continuous use to the present day.
【Common Uses】 Η is highly active across disciplines and frequently appears alongside other Greek capitals such as Δ (Δ), Σ (Σ), Π (Π) and Ω (Ω) in formulas, papers, and engineering drawings. Its clear shape and long tradition make it a standard symbol in many fields.
How to Type Eta Symbol
Windows Input
Method 1: Hold Alt and type 919 on the numeric keypad, then release Alt to get Η.
Mac Input
Method 2: Press Control + Command + Space to open the Character Viewer, search for "greek" or "Eta Symbol", then select Η.
HTML/CSS Input
HTML: Η or Η; CSS: content: "\0397";
LaTeX Input
The capital Eta Symbol Η has no dedicated LaTeX command because it is identical to the Latin capital H; simply type H in math mode to produce Η.
Eta Symbol FAQ
How is Η pronounced?
The English pronunciation of Η is EE-tuh (IPA: /ˈiːtə/). It is the anglicized name of the Greek letter, used directly rather than described as "uppercase Η".
What is the difference between Η and the Latin letter H?
Η (U+0397) is a Greek capital letter, whereas H is a Latin letter; their codepoints and glyphs differ. In a proper typeface Η and H are clearly distinct, but in plain text or sans-serif fonts they can be confused, so rely on context.
How do I type Η in Word, web pages, and LaTeX?
On Windows use Alt+919 on the numeric keypad; on Mac open the Character Viewer and search "greek" or "Eta Symbol"; on the web use the HTML entity Η; in LaTeX simply type the letter H.