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In the mid-23rd century the Cochrane delta was adopted as the insignia of the Constitution-class USS Enterprise (Star Trek: The Original Series) before being applied to the whole of Starfleet in recognition of the Enterprise's successful mission. (Star Trek: The Motion Picture)
The Cochrane delta was still used as part of Starfleet's insignia well into the 29th century and its origin was still recognised during the 24th century. (VOY: "Relativity"; Star Trek: The Adventures of Argus)