Thanks for the corrections and information, Jason.The B is inserted by the CAD system to indicate the unit is in a BUSY status.
What does "busy" mean? That they're not available period, or that they're on an incident but subject to being retoned, or ???
Up here in Humboldt most police agencies, other than CHP of course, have dropped most codes except the common crime codes (211, 459, 415, etc) in favor of LAPD-like plain language. The Sheriff's dept has even taken to using the word "busy" when a deputy is involved in an arrest, search, or whetever and isn't going to be available for calls for a while.