Teracycle
A teracycle was a unit of measure for rotating frequencies.

When the MACOs aboard  was having difficulty battling the invading Sphere-Builders, Doctor Phlox explained to Corporal  to modulate his weapons to a rotating frequency of 32.6 teracycles when firing at aliens; a number he was able to determine thanks to his previous studies conducted on their alien physiology. ()

See also 
 Terahertz

Measurements