PPG

Pacific Proving Grounds, a former US-operated nuclear test site
Photoplethysmograph, an optically obtained volumetric measurement of an organ
Pterygopalatine ganglion, one of the four Parasympathetic ganglia of the head and neck
Pteridophyte Phylogeny Group, a group promoting the taxonomy of pteridophytes

Photolabile protecting group, a strategy to temporarily protect functional group(s) and liberate upon action of light
Policosanol, a nutritional supplement
PPG Industries, a U.S. manufacturer, formerly known as Pittsburgh Plate Glass
- PPG Place, its office complex
Polypropylene glycol, a polymer
Post-prandial glucose, a measure of blood sugar after a meal
Pounds per gallon, a measure of density, typically of a fluid. It is common in the oil industry, especially as a unit for Mud weight.
Purpurogallin, the aglycon of several glycosides from nutgalls

PPG Phonem, a vocal synthesizer
Palm Products GmbH, an audio synthesizer company
Penile plethysmograph a device to measure male arousal
Push Proxy Gateway, a component of a WAP server in telecommunications
Pulse pattern generator, a piece of electronic test equipment or software used to generate digital electronics stimuli
Personal Protective Ground, a safety device that is conductive, used to ground electrical equipment in case of accidental energization during work

Science and technology