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O	oxygen
OBA	object behavior analysis
OBEM	Object-Based Equipment Model
OBIC	optical beam-induced current
OBL	object-based language
OC	open cassette
OCR	optical character recognition
OD	outside diameter
ODS	ozone-depleting substances
OEE	overall equipment effectiveness
OEM	original equipment manufacturer
OES	optical emission spectroscopy
OHT	overhead transport; overhead hoist transport
OHV	overhead vehicle
OL	overlay
OLB	outer lead bond
OLE	object linking and embedding
OM	operational modeling; optical microscopy
OMA	object management architecture
OMS	optical mass spectroscopy
OMT	object modeling technique
OO	object-oriented
OOA	object-oriented analysis
OOD	object-oriented design
OODB	object-oriented database
OODBMS	object-oriented database management system
OOP	object-oriented programming
OPC	optical particle counter; optical proximity correction
OS	operating system
OSD	organic spin-on dielectric
OSF	Open Systems Foundation
OSG	organosilicate glass
OSI	open system interconnection
OSRM	Office of Standard Reference Materials
OSS	Object Services Standard
Ox	oxide