Bogey Markers

I just recently painted up two dozen bogey markers, and now I'm ready to
put
ID letters on them. What do you use for IDs?  

I'd prefer to ID them with a single letter denoting ship class and a
number
for the marker. Escorts are easy, as you can label them E# (as in E1,
E2,
E3, etc.). How do would you denote capital ships and cruisers? 

I'm just wondering if there is some sort of standard out there.

Allan Goodall:	agoodall@sympatico.ca 
"You'll want to hear about my new obsession.
 I'm riding high upon a deep depression. 
 I'm only happy when it rains."    - Garbage