Particle matrix
The particle matrix was a component on Starfleet vessels whose function fed into the shields.

At Starfleet Academy in the 2250s, Sylvia Tilly (as part of a drinking game) successfully swapped a particle matrix and emitter while blindfolded. She later used this skill in combat aboard the , during the Battle near Xahea in 2257. From a Jefferies tube in zone 4, she was successfully able to restore shield strength to 40%. ()

See also
 Particle emitter
 Shield generator
Spacecraft components