|PHz is the abbreviation for PetaHertz.
Peta is derived from the Greek word "pente", which means five. In the realm of science, Peta, or P, is the SI (Systeme International) prefix for 10^15 or 1,000,000,000,000,000.
Hertz, as we all know, is a unit of frequency equal to one cycle per second named after Heinrich Rudolf Hertz - a German physicist who was the first man to produce electromagnetic waves artificially.
PetaHertz is a unit of measure for very fast frequencies. If Moore's Law remains accurate, we could see computer processors reach speeds near 1 PetaHertz as early as 2022!
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