Some of my personal favorites would be:
back to square one
Being inclined to O&G, probably the vain plates would sound something like:
LSC 5 (LSCS)
TAH 850 (TAHBSO)
CA 125 (the tumor marker)
Probably there are special vanity plates for my colleagues from other specialty, what would it be, I wonder...
Ortho: BK 4? AK 4?
Surgery: MRC 5? BRC 4?
However, at the end of the day, I guess I'll pretty happy with this number
Not too vain. Not too vain. Just a moment to remember.