abbr.	Organization of Arab Petroleum Exporting Countries	OAPEC
		abbr. lat.	obiit	ob. (died)
		abbr. astr. lat.	Octans	Oct (the Octant, Октант)
		abbr. phys.	Oven-Controlled Crystal Oscillator	OCXO (http://en.wikipedia.org/wiki/Crystal_oven)
		abbr.	OD	officer of the day (on duty)
		abbr.	Optical Digital Image	ODI
		abbr.	Overlay Description Language	ODL
		abbr.	On-line Debugging Technique	ODT
		abbr. phys.	Optical Emission Spectrometers	OES
		abbr.	Oxygen Free High-Conductivity Copper	OFHC
		abbr. chem.	Octadecyl Hydrogen Maleate	OHM (organic crystal used as an analyser in X-ray spectrography)
		abbr.	ohm	ohm
		abbr. med.	Ovarian HyperStimulation Syndrome	OHSS
		abbr.	Only-In-Chain	OIC
		abbr.	Optimised Instruction-Set Computer	OISC
		abbr.	Object Linking & Embedding	OLE
		abbr.	Optical Mark Reading	OMR
		abbr.	Optical Music Recognition	OMR
		abbr.	ON	Ontario
		abbr.	Optimal Normal Basis representation of finite fields	ONB
		abbr.	in the work cited	op. cit.
		abbr. astr. lat.	Ophiuchus	Oph (the Healer, Змееносец)
		abbr. med.	ophthalmology	ophth
		abbr. astr. lat.	Orion	Ori (Орион)
		abbr.	On Screen Display	OSD
		abbr.	Office of Software Development and Information Technology	OSDIT
		abbr.	Oil Slick Detection Radar	OSDR
		abbr.	Orbiter Support Equipment	OSE
		abbr.	Overall Severity Estimate	OSE
		abbr. math.	One-Sided Geometrical Distribution	OSGD
		abbr.	Office of Safety and Health Administration	OSHA
		abbr. tech.	Oil well with Shut In	OSI
		abbr. med.	osmolality	osm
		abbr.	Object Time System	OTS
		abbr. med.	OU	each eye
		abbr.	our telex	ourtel
		abbr.	Optimal Working Frequency	OWF
		abbr.	postage and packing	p & p
		abbr.	port	p
		abbr.	pages	p.
		abbr.	past	p. (tense)
		abbr.	past month	p./m.
		abbr. lat.	per annum	p/a (annually)
		abbr.	party cash	p.c.
		abbr.	petty cash	p.c.
		abbr.	per day	p.d.
		abbr.	P.D.	port dues
		abbr.	P.O.B.	post office box
		abbr.	Post-Office Saving Bank	P.O.S.B.
		abbr.	postage paid	p.p.
		abbr.	pages	p.p.
		abbr.	please turn over	p.t.o.
		abbr.	particular charges	p/c
		abbr.	price current	p/c
		abbr.	price catalogue	p/c
		abbr.	price-earnings ratio	p/e
		abbr.	port of embarkation	p/e
		abbr.	payment order	p/o
		abbr.	Professional's Operating System	P/OS
		abbr.	Program Access	PA
		abbr.	Program Attention	PA
		abbr. comp.	Programmer Access Code	PAC
		abbr. econ.	Put and Call Options	PAC (PAC straddle)
		abbr. tech.	Planning Advisory Committee	PAC
		abbr. tech.	Planning Analysis and Control	PAC
		abbr. bibliogr.	Physics and Astronomy Classification Scheme	PACS
		abbr. tech.	Pitch Active Control System	PACS
		abbr.	Performing Arts Data Service	PADS
		abbr.	Police Athletic League	PAL
		abbr.	Polyciclic Aromatic Hydrocarbon	PAM
		abbr. geogr.	Papua New Guinea	Pap.N.G.
		abbr.	Page Address Register	PAR
		abbr. geogr.	Paraguay	Par.
		abbr. lat.	passim	pass. (throughout)
		abbr.	passive	pass. (mood)
		abbr. astr. lat.	Pavo	Pav (the Peacock, Павлин)
		abbr.	Pipelined Burst SRAM	PB SRAM
		abbr.	Policeman's Benevolent Association	PBA
		abbr.	Process Control Block Base Register	PCBB
		abbr. comp.	Personal Communication Device	PCD
		abbr. comp.	Plotter Characterization Data	PCD
		abbr. comp.	Kodak Photo CD format	PCD
		abbr.	PCE	personal consumption expenditure (s)
		abbr.	Peripheral Component Interconnect bus	PCI
		abbr. med.	PCOS	polycystic ovarian syndrome
		abbr. med.	PCP	Pneumocystis carinii pneumonia
		abbr. cryptogr.	Private Communications Technology	PCT
		abbr. med.	PCWP	pulmonary capillary wedge pressure
		abbr.	Peripheral Device	PD
		abbr.	PD	pickup and delivery
		abbr. tech.	Producer Durable Equipment	PDE
		abbr. comp.	Package Definition File	pdf
		abbr. comp.	Packet Data FIFO Buffer	pdf
		abbr.	Program Design Language	PDL
		abbr.	Push-Down List	PDL
		abbr.	Page Descriptor Register	PDR
		abbr. comp.	Phase-Encoded	PE
		abbr. geogr.	Prince Edward Islands	PE
		abbr. med.	PE	pulmonary embolism
		abbr. med.	pediatric	ped

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