What do the following items have in common?
The La Brea Tar Pits
A PIN number
The River Avon
Mount Fuji-yama
A hot water heater
(In reply to
A Guess by Jim Lyon)
The "Go to list of errors" link from here includes a lot of these kind of things.
PIN Number
ATM Machine
CD Disk
HIV Virus
"Please RSVP"
etc.