Andy Lee has a interesting writeup based on the question posed by Peter Hosey:
what the longest symbol name (not selector) in Apple’s APIs?
Ken Ferry and Bavarious found this:
kCMSampleBufferConduitNotificationParameter_
UpcomingOutputPTSRangeMayOverlapQueuedOutputPTSRange
Yikes. Read Andy’s post to get more details on the search process, which includes code examples of searching the API’s.