Yes, there are a few examples from Voyager.
Janeway uses the code "Janeway-Pi-1-1-0" in the season 2 episode 17, "Dreadnought:"
JANEWAY: Computer, initiate the self-destruct sequence. Authorisation Janeway pi one one zero. Set it at twenty minutes.
and then again a few episodes later in season 2 episode 21, "Deadlock":
JANEWAY 2: Move it, Ensign! That's an order! Computer, initiate the self-destruct sequence. Authorisation Janeway pi one one zero. Set at five minutes and mute voice warnings. Enable.
Later in season 7 episode 4, "Repression," Tuvok uses the code "Tuvok pi alpha" twice:
TUVOK: Security override Tuvok pi alpha.
TUVOK: Computer, override those security restrictions. Authorisation Tuvok pi alpha.
and again in season 7 episode 12, "Lineage:"
TUVOK: Override authorisation Tuvok pi alpha.