What does PH stand for?

Phase

Part of an AC voltage cycle. Residential electrical service is 2-phase; commercial facilities are usually 3-phase AC voltage. Term used to describe one of the three branches of electricity in most high-voltage circuits. The three phases all carry power simultaneously. A time-based relationship between a periodic function and a reference. A period of time that is used to plan, schedule, and perform maintenance tasks. alsoquality status.2.In PSF/VSE, the smallest complete unit that can be referred to in a library.