In source code, there are many library in ardupilot/libraries/. Some library names are prefixed with AC and AP，What is the meaning of “AC” and “AP”?
ArduCopter ArduPilot ??
I have no idea, maybe you are right!
Atitude Control and Ardupilot Peripherals? ???
Since everyone is guessing
Are you serious???
AC = ArduCopter: normally code restricted for copter type configuration
AP = ArduPilot: generic name for libraries
AR = ArduRover: code restricted for rover type configuration
Is there a marker for an ArduPlane?