Light Finding Operation
From Eureka Seven Wiki
The mecha in the anime series Eureka Seven are called LFOs, which stands for Light Finding Operation. LFOs are bio-mechanical hybrids: armor and control systems are built upon an organic humanoid "skeletons" excavated from the Scub Coral. The LFOs in the series are primarily used by the military as an all-purpose assault unit, capable of engaging targets in both ground and aerial combat.
The LFO operates using transparence light particles and the Compac Drive (except for humanoid Scub Coral, like Eureka and Anemone).
