ROF

Rate of Fire.

Examples of High ROF weapons are: Machine-guns, Leech guns, Polarity guns.

Examples of Low ROF weapons are: Torqueshell Rifles, Rocket Launchers.

Generally high ROF weapons do less damage per hit but hit more often. Weapons with high ROF that features continuous fire like Machine-guns also do not suffer from lag (client-server latency) between shots.