Rear admiral
Rear admiral was a flag officer rank above commodore but below vice admiral. As a Starfleet rank, it was used by the United Earth and Federation Starfleet.

On the , rear admirals, such as Daniel Leonard, were denoted by two rank insignia enclosed in a rectangular frame, worn on both sides of a uniform jacket. These officers also had a series of rank stripes on their sleeve, a group of four stripes (three in a group, and one separate towards the cuff). ()

Later Starfleet rear admirals, such as James T. Kirk, were again denoted by sleeve stripes, this time signified by a similar insignia, one solid band of braid, and an additional stripe separate. Rear admiral's shoulder insignia, for epaulet uniforms, was a single eight pointed star. ()

On the , Kirk, and all other officers, wore their insignia as a pin device attached to the shoulder on the jacket clasp. The rear admiral pin was a small round field with four gold arrowheads arranged pointing towards the center, and was accompanied by an embroidered sleeve stripe. ()

In the 2360s, rear admirals like Starfleet Academy superintendent , were denoted by two gold rank pips surrounded by a square frame. ()

Starfleet rear admirals

Cobum

James T. Kirk
Daniel Leonard
M.C. Minor
Erik Pressman
Rollman
Norah Satie
Shukar
Sitak

Background information 
Robert Blackman's production notes during  described this rank as "2 Starfleet Admiral, gold framed bar w/2 dots." 

The  labeled this rank as "rear admiral" referring to the , and "admiral, two star" referring to its use on , , and .

, mistakenly identified the late 2270's-2350's commodore insignia as the rear admiral insignia.

External links 
 
 

bg:Контраадмирал
cs:Kontradmirál
de:Rear Admiral
es:Contralmirante
fr:Contre-amiral
ja:少将
nl:Schout-bij-nacht
sv:Konteramiral
Military ranks