Squadron

A squadron is a small grouping of starships or aircraft.

The Cardassians called a squadron a dai'elkor, which was a grouping of five vessels commanded by a glinn or a kel. 

In the Dominion a squadron was a group of three to six small attack craft such as Jem'Hadar attack ships and commanded by a Vorta Vara'thoran. 

Prior to the First Battle of Chin'toka, the entire Dominion force protecting the star system was only five squadrons. (: "Into the Fire")

A squadron within Starfleet was usually a grouping of two to four starships or attack fighters. 

Starfleet Starfighter Corps had its squadron sized units based around a grouping of twelve fighters.