A map of the Milky Way Galaxy
The Orion Arm is a collection of stars, planets, nebulae, and other spatial objects that form one of many curved "arms" shooting out from the center of the Milky Way Galaxy.
The Orion Arm (or Local Spur/Orion Spur) is a minor "arm", extending from the Sagittarius Arm, and is the location of the Sol System.
The Orion Arm was shown on a computer panel in astrometrics on the USS Voyager during the later years of its seven-year journey in the Delta Quadrant. (background graphic, Star Trek: Voyager)
The graphic is also shown (in legible detail) in Geoffrey Mandel's Star Trek: Star Charts.