Use this template for controls to include a tooltip of keys that map to that control by default.
For example, instead of writing:
Hold X to exit the screen.
You should instead write:
Hold the {{control|menu}} key to exit the screen.
Which would present:
Hold the menu key to exit the screen.
Alternatively, you could write:
Hold the {{control|menu|menu key}} to exit the screen.
Which would present:
Hold the menu key to exit the screen.
The purpose of this template is to avoid suggesting specific keys when in actuality a range of keys can be used.
Technically it's still possible to put a specific key in the second parameter and display something like "Hold esc", but this is more confusing.
The special value |2 = show_set outputs the keys as text instead of in a tooltip:
Use the {{control|directional|show_set}} keys to move.
Use the Arrow keys / Numpad 2 4 6 8 / HJKL keys to move.