Ph

From Freepedia

PH or ph or pH or Ph may be:

• pH, a measure of acidity (chemistry)
• Ph, a phenyl ring (organic chemistry)
• PH, the ISO country code of the Philippines
• ph or phot, a measurement of illuminance (photometry)
• PH, the union of all complexity classes in the polynomial hierarchy (computational complexity theory)
• the Greek letter φ (Greek alphabet)
• ‹ph›, a digraph (two graphemes, p and h) that represents the phoneme /f/ (phonetics)