Final answer:
The command key that locates and starts playing automatically is the spacebar.
Step-by-step explanation:
The command key that locates and starts playing automatically on various devices is the spacebar.
For example, on a computer, pressing the spacebar will start and stop the playback of media files such as videos or music.
On a TV remote, the play/pause button usually has a symbol that resembles two vertical lines, which acts as the equivalent of the spacebar on a computer.