Yeoman

Yeoman was a Starfleet title used during the 23rd century. They functioned as personal assistants, performing various tasks, such as carrying a Starfleet tricorder and retrieving information for a starship's captain, announcing one's arrival with a boatswain's whistle, or bringing them meals. Throughout the 2260s and 2270s, yeomen were typically – but not exclusively – young women; there were also male yeomen during the 2250s and the 2290s.
Some yeomen, such as Janice Rand, were enlisted personnel during their time in this position. There were different rates of yeoman, all the way down to "third class." Seventeen-year-old Tina Lawton carried this rate in 2266.
Yeomen could also have held the rank of a junior officer, as seen with a yeoman assigned to the USS Enterprise-A, who wore an officer's uniform with the rank of lieutenant junior grade.