Command star

A command star was a decoration worn on the collar of Starfleet officer's dress uniform, granted for command of a starship.

In 2412, Tiana Lanstar noted that her former Starfleet Academy tutor Kanril Eleya now wore two command stars on her dress whites, in addition to the four pips of a full captain.
 * One of these stars is identified in-story as being for Kanril's current command, the USS George Hammond.