A real desk bell, like the kind found on a hotel or receptionist's desk. Just one ring. Recorded at close range with my camcorder. Processed to remove backgroundnoise and to keep from over-blowing the beginning of the attack.
Absolutely beautiful! Playing a MUSH (Telnet game) which has the line "You can hear the registration bell ring in the distance." and sends the beep character. I figure, hey, why not a real desk bell instead of my 1-second 220Hz beep?