- post office , PO
- post outlet
- postal outlet
- post-mortem photography
- postpartum psychosis , PPP
- post office shop
- post-office substation
- postaggression syndrome
- postal survey
- postanalytic philosophy
- post office employee
- postal money order
- postal order, PO, P.O.
- postal order form
- postanesthetic
- postanesthetic myopathy , PAM
- postanaesthetic myopathy , PAM
- post office van
- postal savings bank
- postal check
- postal cheque
- post bus
- postcholecystectomy syndrome , PCS
- postdoctoral research
- picquet
- piquet duty
- posterior cortical atrophy , PCA
- posterior reversible encephalopathy syndrome , PRES
- posterolateral myocardial infarction , PLMI
- PO box
