Cochrane delta

The Cochrane delta is the name given to the standard asymmetric energy-curve used by Zefram Cochrane to illistrate his the energy expenditure in his theory of continuum distortion. (Novel: "")

In the mid 23rd century the Corchrane Delta was adopted as the insignia of the USS Enterprise (NCC-1701) before being applied to the whole of Starfleet to celabrate the success of the Enterprise's mission. 

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.