Abbreviations

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	a.c.	Alternating current
	a.f.	Audio frequency
	a.f.c.	Automatic frequency control
	a.g.c.	Automatic gain control
	a.m.	Amplitude modulation
	A.S.A.	American Standards Association
	a.t.u.	Aerial tuning unit
	a.v.c.	Automatic volume control
	A/D	Analogue to digital
	A/F	Across Flats - width of nut/bolt etc.
	abs	Absolute
	ABS	Acrylonitrile Butadiene Styrene
	ACK	Acknowledge
	ADC	Analogue to digital converter
	ADSL	Asymmetrical Digital Subscriber Line
	Ae	Aerial
	Ag	Silver (Chemical Symbol)
	Ah	Ampere Hour
	Al	Aluminium (Chemical Symbol)
	amp	Ampere
	ANSI	American National Standards Institute
	Ar	Argon (Chemical Symbol)
	ARCNet	Attached Resource Computer Network
	As	Arsenic (Chemical Symbol)
	ASCII	American Standard Code for Information Interchange
	ASK	Amplitude shift keying
	ASTA	Association of Short Circuit Testing Authorities
	ASTM	American Society for Testing and Materials
	ATE	Automatic Test Equipment
	atm	Atmosphere
	ATM	Asynchronous Transfer Mode
	Au	Gold (Chemical Symbol)
	AUI	Attachment Unit Interface (15 way 'D' Connector)
	AUX	Auxiliary
	AV	Audio Visual
	AWG	American Wire Gauge
	AWM	Appliance Wiring Material