Keychord doc

key-chord-define is an autoloaded compiled Lisp function in
‘key-chord.el’.

(key-chord-define KEYMAP KEYS COMMAND)

Define in KEYMAP, a key-chord of the two keys in KEYS starting a COMMAND.

KEYS can be a string or a vector of two elements. Currently only elements
that corresponds to ascii codes in the range 32 to 126 can be used.

COMMAND can be an interactive function, a string, or nil.
If COMMAND is nil, the key-chord is removed.