The USS Lagrange (NCC-3916) was a Ptolemy-class transport/tug active in the 23rd century. (Star Fleet Technical Manual) Throughout much of its operational lifetime, Lagrange was assigned to the Starfleet First Fleet.
Prior to the 2270s Fleetwide adoption of the Enterprise delta shield as an insignia, the assignment patch for Lagrange was a representation of an orbital libration point, or Lagrange point as discovered by Joseph Louis Lagrange, within which the division symbols would be. (Starfleet Communiqué 8)
|Al-Rashid - Aristarchus - Copernicus - Deirdre - Ptolemy - Thales|
|Kepler subclass: Brahe|
|Doppler subclass: Rittenhouse|
|Dollond subclass: Chandrasekhar - Lagrange - Wolf|