Iota Symbol
Ι ι
The iota symbol (Ι / ι) is a letter of the Greek alphabet. This page covers its meaning across mathematics, science, and engineering, its Unicode code point, TeX command, and Windows Alt codes — and you can copy and paste the iota symbol with one click.
Uppercase Iota Symbol (Ι)
| Symbol | Format | Data |
|---|---|---|
| Ι | Unicode | U+0399 |
| Ι | HTML | Ι |
| Ι | CSS | \0399 |
| Ι | JavaScript | \u0399 |
| TeX | \Iota | |
| SVG | Download ↓ | |
 | Image | Download ↓ |
Also known as: iota, uppercase iota, big iota, greek iota, greek i, i greek letter, greek letter i.
The Greek capital letter Iota (Ι) is identical in appearance to the Latin capital I and therefore sees little independent use in mathematical notation. Where it does occur, it typically labels a set or mapping within a Greek-letter naming scheme. The lowercase iota appears more often, for instance as an inclusion map in topology and set theory.
Lowercase Iota Symbol (ι)
| Symbol | Format | Data |
|---|---|---|
| ι | Unicode | U+03B9 |
| ι | HTML | ι |
| ι | CSS | \03b9 |
| ι | JavaScript | \u03B9 |
| TeX | \iota | |
| SVG | Download ↓ | |
 | Image | Download ↓ |
Also known as: greek iota, lowercase iota, small iota, iota letter, greek i, ninth greek letter.
Iota is the ninth letter of the Greek alphabet, and its lowercase form ι resembles a small vertical stroke. In mathematics it occasionally denotes an inclusion map in algebra and topology, and in formal logic it appears in definite description notation. It is far less common than letters like α, β, or γ.
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