# Keycodes Overview
When defining a [keymap](keymap.md) each key needs a valid key definition. This page documents the symbols that correspond to keycodes that are available to you in QMK.
This is a reference only. Each group of keys links to the page documenting their functionality in more detail.
## [Basic Keycodes](keycodes_basic.md)
|Key |Aliases |Description |
|-----------------------|--------------------|-----------------------------------------------|
|`KC_1` | |`1` and `!` |
|`KC_2` | |`2` and `@` |
|`KC_3` | |`3` and `#` |
|`KC_4` | |`4` and `$` |
|`KC_5` | |`5` and `%` |
|`KC_6` | |`6` and `^` |
|`KC_7` | |`7` and `&` |
|`KC_8` | |`8` and `*` |
|`KC_9` | |`9` and `(` |
|`KC_0` | |`0` and `)` |
|`KC_F1` | | |
|`KC_F2` | | |
|`KC_F3` | | |
|`KC_F4` | | |
|`KC_F5` | | |
|`KC_F6` | | |