There must be a guidance somewhere that specifies how to write the aircraft types in the logbooks. In the end, as long as the FAA knows what aircraft you flew, it shouldn't be a problem (to-may-to, to-mah-to), but if there is a right way, I'd like to do it the right way (I'm a semi-perfectionist and it would look nice in the logbook to have all the entries to look alike).
Quick example: I've seen different instructors write "C172S", "CE-172 SP", and I'm sure a couple other variations all for the Cessna 172 Skyhawk Nav III. Is it just a "C" or "CE"? Should it be an "S" or "SP"? Is there a hyphen? Is it just me or are there minute differences between how the FAA, manufacturer, and operator identifies the same aircraft--and how should I write it in my logbook?