This is about the Starfleet commendation. You may also be looking for the Vulcanian Scientific Legion of Honor.

The Legion of Honor was a commendation given by Starfleet to honorable Starfleet members.

Leonard McCoy received the Legion of Honor prior to 2267. (TOS: "Court Martial")

Data received the Legion of Honor prior to 2365. (TNG: "The Measure Of A Man")