The ranks in Starfleet are (so far as I'm aware) as such:
- Fleet Admiral [OOOOO] (Fleet Admiral Hanson, The Best of Both Worlds, Part II (TNG))
- Admiral [OOOO] (Admiral Cartwright, ST6: The Undiscovered Country)
- Vice Admiral [OOO] (Vice Admiral Nakamura, The Measure of a Man (TNG))
- Rear Admiral [OO] (Rear Admiral Kirk, The Lost Years (TOSN))
- Commodore [O] (Commodore Matthew Decker, The Doomsday Machine (TOS))
- Captain OOOO (Captain Picard, TNG)
- Commander OOO (Commander Riker, TNG)
- Lieutenant Commander OOO (Lieutenant Commander Data, TNG)
- Lieutenant OO (Lieutenant Kyle, TOS)
- Lieutenant Junior Grade OO (Lieutenant Junor Grade LaForge, TNG Season 1)
- Ensign O (Ensign Laren, TNG)
- Cadet 4th Year ||||
- Cadet 3rd Year |||
- Cadet 2nd Year ||
- Cadet 1st Year |
Bold text on a pip indicates that it is a black pip, otherwise they are gold.
info from around the web, list and graphics of pips from http://st-frontiers.com/stf-graphicranks.htm, many examples of characters from http://members.aol.com/trekannex/index.htm | 
