This is a group of X-wings.
A squadron represented a unit in the air or in space, typically consisting of starfighters, for instance, the T-65B X-wing starfighter. In some cases, squadrons could be specialized groups of larger warships, like Death Squadron. Starfighter squadrons most often had 12 ships. These squadrons were given names and generally had a Wing Commander or leader to command the pilots. Larger groups would be commanded by an Admiral or Captain. Darth Vader, the Dark Lord of the Sith, personally commanded Death Squadron. A squadron admiral was the admiral in command of a naval squadron.
The term "squadron" was also used for army units, such as the Lightning Squadron of the Grand Army of the Republic. During the Clone Wars, the squadron's Advanced Recon Force Scout Troopers were used as reconnaissance and cavalry on the battlefield of Ryloth. All Terrain Tactical Enforcers were also part of a squadron during the Second Battle of Felucia, identified by a unique insignia. Some squadrons could also be groups of elite soldiers, for example, Inferno Squadron, more commonly known as Inferno Squad.