What is the meaning of "AC" and "AP"

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 ??

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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

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Is there a marker for an ArduPlane?