abbr.	OB-GYN	obstetrics-gynaecology
		lat.	ob.	obiit (died)
		lat.	Oct	Octans (the Octant, Октант)
		abbr. phys.	OCXO	Oven-Controlled Crystal Oscillator (http://en.wikipedia.org/wiki/Crystal_oven)
		abbr. med.	OD	oculus dextra (Latin)
		abbr.	ODECO	Ocean Drilling and Exploration Company
		abbr.	ODI	Optical Digital Image
		abbr.	ODT	On-line Debugging Technique
		abbr. phys.	OES	Optical Emission Spectrometers
		abbr.	OFHC	Oxygen Free High-Conductivity Copper
		abbr.	OGL	open general license
		abbr. chem.	OHM	Octadecyl Hydrogen Maleate (organic crystal used as an analyser in X-ray spectrography)
		abbr. med.	OHSS	Ovarian HyperStimulation Syndrome
		abbr.	OIC	Only-In-Chain
		abbr.	OILS	open individual license system
		abbr.	OISC	Optimised Instruction-Set Computer
		abbr. file.ext.	OKT	Music format (Oktalizer Module, Oktalizer)
		abbr.	OLE	Object Linking & Embedding
		abbr.	ONB	Optimal Normal Basis representation of finite fields
		abbr.	op. cit.	in the work cited
		abbr.	OPCOM	Operator Communication Manager
		lat.	Oph	Ophiuchus (the Healer, Змееносец)
		med.	ophth	ophthalmology
		abbr.	OR	operational
		lat.	Ori	Orion (Орион)
		abbr. med.	OS	oculus sinistra
		abbr.	OSDIT	Office of Software Development and Information Technology
		abbr.	OSDR	Oil Slick Detection Radar
		abbr.	OSE	Orbiter Support Equipment
		abbr.	OSE	Overall Severity Estimate
		abbr. math.	OSGD	One-Sided Geometrical Distribution
		abbr. OHS USA	OSHA	Office of Safety and Health Administration
		abbr. tech.	OSI	Oil well with Shut In
		med.	osm	osmolality
		abbr.	OTS	Object Time System
		abbr.	ourtel	our telex
		abbr. file.ext.	OVL	Overlay
		abbr. file.ext.	OVR	Overlay
		abbr.	OWF	Optimal Working Frequency
		abbr.	P & L. a/c	profit and loss account
		abbr.	p & p	postage and packing
		abbr.	p	port
		comp.	P-E ratio	Price/Earning Ratio
		abbr.	p.	pages
		abbr.	p.	past (tense)
		abbr.	p./m.	past month
		abbr.	p.c.	party cash
		abbr.	p.c.	petty cash
		abbr.	p.d.	per day
		abbr. lat.	P.M.	post meridiem (after noon)
		abbr.	P.O.D.	pay on delivery
		abbr.	P.O.S.B.	Post-Office Saving Bank
		abbr.	p.p.	pages
		abbr.	p.p.	postage paid
		abbr. comp.	P.S.	PostScript format
		abbr. med.	P.S.	pulmonic stenosis
		abbr.	P.S.	postscriptum
		abbr.	p.t.o.	please turn over
		abbr.	P.V.	petite vitesse (ordinary goods; Fr.)
		lat.	p/a	per annum (annually)
		abbr.	P/A	personal assistant
		abbr.	p/c	particular charges
		abbr.	p/c	price catalogue
		abbr.	p/c	price current
		abbr.	p/e	port of embarkation
		abbr.	p/e	price-earnings ratio
		abbr.	P/L	profit and loss
		abbr.	p/o	payment order
		abbr.	P/OS	Professional's Operating System
		abbr.	P/S	public sale
		abbr.	P/V	profit-volume
		abbr. comp.	PAC	Programmer Access Code
		abbr. tech.	PAC	Planning Advisory Committee
		abbr. tech.	PAC	Planning Analysis and Control
		abbr. file.ext.	PAC	SBStudio II Package or Song (SBStudio II)
		abbr. econ.	PAC	Put and Call Options (PAC straddle)
		abbr. tech.	PACS	Pitch Active Control System
		abbr. med.	PADP	pulmonary artery diastolic pressure
		abbr.	PADS	Performing Arts Data Service
		abbr. file.ext.	PAK	Archive format (Pak archiver)
		abbr. file.ext.	PAL	Palette file (Microsoft Draw, Win. Paintbrush)
		abbr.	PAM	Polyciclic Aromatic Hydrocarbon
		abbr. med.	PAP	pulmonary artery pressure
		geogr.	Pap.N.G.	Papua New Guinea
		abbr. file.ext.	PAR	Windows swap file
		abbr.	PAR	Page Address Register
		geogr.	Par.	Paraguay
		abbr. med.	PAS	paraaminosalicylic acid
		abbr. file.ext.	PAS	Pascal language source (Borland Pascal)
		abbr. med.	PASP	pulmonary artery systolic pressure
		lat.	pass.	passim (throughout)
		abbr.	pass.	passive (mood)
		lat.	Pav	Pavo (the Peacock, Павлин)
		abbr. med.	PAWP	pulmonary artery wedge pressure
		abbr.	PB SRAM	Pipelined Burst SRAM
		abbr.	PBA	Policeman's Benevolent Association
		abbr. med.	PBC	primary biliary cirrhosis
		abbr.	Pblc Ho	public house
		abbr.	PC	prime costs
		abbr.	PC	privy councillor

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