Welcome aboard
Those are codes used or Priority Medical Dispatch.
Every county in the state are using them.
If I am not mistaking, each county is different.
I do know that the following is the same for most counties
Alpha Routine Response
Bravo Emergency Slow Response
Delta Emergency Life & Death Response
Echo Emergency Response (Usually reserved for Cardiac Arrest, Gun Shot Wound)
Omega Non-Emergency Scheduled Response
Most counties with the exception of a few usually don't dispatch first responders on Alpha and Omega calls unless lifting assistance is needed.
Then there is one county in the state, that does not even use the term Alpha Response. Everything is Bravo or higher.
I do know in Mecklenburg a code 10 is dispatched as a Delta 10, which is a Chest Pain call.
The new priority dispatch is strange. I am from the old school either a call is routine or emergency.
If I knew where to find a list of the different codes I would be more than glad to pass them alone.
Hope this helps
David