The sign for pardon is related to the sign for "excuse" but the sign "PARDON" (as in "he was pardoned from prison") is done with a single, larger movement. If you mean "pardon me" (as in "excuse me" then just use the normal sign for "excuse."
LAID-OFF / RELEASED FROM DUTY / PARDONED / "you are excused"
Use a single, larger movement:
Animation: To be dismissed, pardoned, or laid off work.
Also see: EXCUSE
Notes:

