CW

Abbreviation for Continuous Wave. The continuous-emission mode of a laser, as opposed to pulsed operation.

HAZ

Heat-Affected Zone, or the area where laser beam and metal (or other) surface are in contact.

NEMA

Abbreviation for National Electrical Manufacturers’ Association, a group which defines and recommends safety standards for electrical equipment.

RMS

Abbreviation for Root-Mean-Square. Units of electronic noise.