turtle nickname

Hello. So I found this once, but cant seem to find it again. Its a command to type into turtle window to give it a nickname or change ID so the ID does not change every time you pick it up. I cant remember what the command is. If someone could let me know, thanks.

Remember that you can use the "programs" program to list all the available programs, and then you can use "help <program name>" to know what each one does.