Title. Basically, “if a street fighter gamer and a linux tryhard had a baby” where a combination of keys is issued to run a command/script rather than a single or a simultaneous stroke of two or more. i.e left, down, left, right arrow keys, R_CTRL to run Firefox. Right, right, Up, right arrow keys, delete to power off the PC, etc.
Don’t know if such command exists, but there you go.
Bonus points if its a standalone and supports X11, Wayland and Arcan.
Most desktop environments you just hit alt+f2 to activate the launcher which lets you run any command you want