6
AA
angular aperture; atomic absorption
7
AAAS
American Association for the Advancement of Science
8
AART
Association for the Advancement of Radiation Technology
9
AAS
American Astronomical Society
11
ABS
acrylonitrile butadiene styrene
13
AC
alternating current
14
ACC
automatic current control
15
ACORN
Advanced Communications Organization Research Network
16
ACOST
Advisory Council on Science and Technology (UK)
17
ACP
acquisition control processor
18
ACR
active-cavity radiometer
19
ACS
American Chemical Society; atmospheric calibration sensor
20
ACTFEL
alternating current thin-film electroluminescent
21
ACTS
advanced communication technology satellite
22
ACTV
advanced compatible television
23
ADC
analog-to-digital converter; allyl diglycol carbonate
24
ADM
adaptive delta modulation
25
ADP
ammonium dihydrogen phosphate
26
ADPCM
adaptive delta pulse code modulation
27
ADS
angular displacement sensor
28
ADSL
asymmetric digital subscriber line
29
ADT
automatic data transmission
30
AEA
American Electronics Association
31
AEL
accessible emission limit
33
AES
Auger electron spectroscopy; atomic emission spectrometry
34
AF
audio frequency; autofocusing
35
AFC
automatic frequency control
36
AFCEA
Armed Forces Communications and Electronics Association
37
AFM
atomic force microscope
38
AFOSR
Air Force Office of Scientific Research
39
AFS
atomic fluorescence spectroscopy
40
AGC
automatic gain control