1
R
resistance; roentgen; Rankine
4
RACE
research into advanced communications in Europe
6
radar
radio detection and ranging
7
RAE
resistive anode encoder
8
RAI
random access integration
9
RAM
random access memory
10
RAS
remote active spectrometer
11
RBDE
radar bright display equipment
12
RBOC
regional Bell operating company
13
RBS
Rutherford backscattering spectrometry
14
RBV
return beam vidicon
16
RC
reaction chamber; resistance × capacitance
19
RDA
radar data acquisition
20
RDS
rapid display system
21
RED
radian energy distribution
22
REE
rare earth element
23
REM
rapid eye movement
24
RF
rangefinder; radio frequency; representative fraction
25
RFE
radio frequency excitation
26
RFI
radio frequency interference
27
RFID
radio frequency identification
28
RFOG
resonant fiber optic gyroscope
29
RFT
rich field telescope
32
RHCP
right-hand circular polarization
33
RHEED
reflection high-energy electron diffraction
34
RHEF
Raman holographic edge filter
35
RIA
Robotic Industries Association
36
RIBE
reactive ion-beam etching
37
RIMS
resonance ionization mass spectrometry
38
RIN
relative intensity noise
39
RIP
refractive index profile
40
RIR
resonant internal reflection