Ι
Capital Iota Symbol (Ι)
Copy the Capital Iota symbol Ι to your clipboard, and see its Unicode code point, HTML entity, LaTeX command and how to type it on any device.
What does Ι mean?
Ι is the capital form of Iota, letter 9 of 24 in the Greek alphabet (pronounced eye-OH-ta). Its lowercase counterpart is ι. In science and maths it is used for: A very small amount; an index in some notations. Capital Iota looks the same as the Latin capital I, so LaTeX has no separate command for it — write I (or \mathrm{I}) in math mode.
Codes and properties
| Character | Ι |
|---|---|
| Unicode name | GREEK CAPITAL LETTER IOTA |
| Code point | U+0399 |
| Decimal | 921 |
| Unicode block | Greek and Coptic |
| HTML entity | Ι · Ι · Ι |
| CSS | \0399 |
| JavaScript / JSON | \u0399 |
| Python | \u0399 or \N{GREEK CAPITAL LETTER IOTA} |
| UTF-8 bytes | CE 99 |
| LaTeX | I |
How to type Ι
- Copy & paste: press the Copy button above, then paste Ι anywhere — Word, Google Docs, email, chat or code.
- Windows (Word, WordPad, Outlook): type
0399then press Alt+X. In any app, Win+. opens the symbol panel. - Mac: switch to the Unicode Hex Input keyboard, hold Option and type
0399; or press Ctrl+Cmd+Space and search “greek capital letter iota”. - Linux (GTK/IBus): press Ctrl+Shift+U, type
0399, then Space. - HTML:
Ιrenders as Ι. - LaTeX:
Iin math mode.
Frequently asked questions
How do I type Ι on Windows?
In Microsoft Word type 0399 and press Alt+X. In any app press Win+. to open the symbol panel, or copy Ι from this page.
What is the HTML code for Ι?
Use Ι or Ι (hex) or Ι (decimal).
What is the LaTeX command for Ι?
Use I in math mode.