what a great thread to read!
I have always wondered about the sound cue preference. In college, it was letters, then when I started to call shows, the designers used numbers. Then this last round of shows, the designer used letters, but once we reached AAAAA.7, we went back and renamed them so that at Intermission, I'd start over with A.
I've never called a cue without a descriptor, especially as I've been a board op when the stage manager doesn't specify during complex sequences and you lose track. For example, I've fired guns when I shouldn't have because cue lights went off and I couldn't remember if we were on the third blue light or on the fourth call. Or taken a sound cue when it was supposed to be a light cue because we both had a #21 in the sequence (but lights always had a "L" following the number). I'll never forget the patter: "Cue 18L go, Cue 19L go, Cue 19L.5 go, Rail go, Cue 20L go, Cue 21L go, Cue 22L go, Cue 21 go, snow go, cue 23L.5 and the last sound, Cue 22 go. Thank you, and good night."
By the end of the month, I was okay, but boy, I tended to always miss it.