What does PUI stand for?

Pen User Interface - Computer science

Physical Unit of Information - Computer science (IAA)

Picoscopic User Interface (SAUS)

Pilot-under-Instruction - Navy

Platelet Uptake Index - Clinical chemistry

Posterior Urethral Injury - Medicine (RAWO)

Puinave - Language code (ETLW)

Puppit - NCIC firearms make code (NCIC)