Auxiliary Power Unit Air Processing Unit Auxiliary Power Units Auxilixary Power Unit Acid Purification Unit Alaska Pacific University Application Processing Unit Arithmetic Processing Unit Arithmetic Processor Unit Auxiliary Processor Unit American Public University Audio Processing Unit Auxiliary Propulsion Unit Azusa Pacific University Academic Program Unit Accessory Power Unit Accredited Purchasing Unit Acute Psychiatric Unit Advanced Propulsion Unit Aerial Photograph Unit Aeropuma, S.A. aged persons unit Aircraft Performance Unit Aircraft Preparation Unit AmeriGas Partners, L.P. amphiphilic polyurethane Analog Processing Unit Apparent phalangeal ultrasound transmi… Application Unit Applied Psychology Unit