ANSI/BHMA code F02 or F19 Privacy function.
Latch bolt retracted by lever/knob from either side. Deadbolt thrown or retracted
by inside thumb turn only. Throwing deadbolt locks outside knob/lever and free
wheeling. To unlock from outside, rotating outside coin turn retracts deadbolt
and unlocks outside knob/lever. Operating inside lever/knob retracts deadbolt
and latch bolt at the same time and unlocks outside lever/knob.