2D	2 Dimensional
3D	3 Dimensional
5G	Fifth generation
6G	Sixth generation
A2A	Air-to-air
A2G	Air-to-ground
A2S	Air-to-satellite
AR	Augmented reality
ACO-OFDM	Asymmetrically clipped optical orthogonal frequency division multiplexing
ATP	Acquisition, tracking, and pointing
AOA	Angle-of-arrival
BER	Bit error rate
BPSK	Binary phase shift keying
CCD	Charge coupled device
CDMA	Code division multiple access
CSI	Channel state information
DC	Direct current
DT/DD	Dual threshold/direct detection
DC-OFDM	Direct current orthogonal frequency division multiplexing
FSO	Free space optical
FOV	Field of view
HAP	High-altitude platform
IM	Intensity modulation
IOWC	Indoor optical wireless communication
LAP	Low-altitude platform
LiFi	Light fidelity
LED	Light-emitting diode
LOS	Line of sight
MIMO	Multi-input and multi-output
MZM	Mach–Zehnder modulation
mm Wave	Millimeter-wave
OAM	Orbital angular momentum
OES	Onboard embedded system
OFDM	Orthogonal frequency division multiplexing
OMU	Optical multipoint unit
OWC	Optical wireless communication
OCC	Optical camera communication
OOK	On/off keying
PV	Photovoltaic
PPM	Pulse position modulation
QKD	Quantum key distribution
QAM-4	Pulse amplitude modulation-4
QAM	Quadrature amplitude modulation
QPSK	Quadrature phase shift keying
QR	Quick response
RF	Radio frequency
RSU	Roadside units
SNR	Sight-of-noise ratio
UAV	Unmanned aerial vehicle
VLC	Visible light communication
WDM	Wavelength division multiplexing