AI	Artificial Intelligence
BMD	Ballistic Missile Defense
cFS	Core Flight System
CSTN	Cognitive Satellite–Terrestrial Integrated Networks
CTI	Cyber Threat Intelligence
DCED	Distributed Collaborative Entrance Defense
DDoS	Distributed Denial of Service
DL	Deep Learning
DOA	Direction of Arrival
DoS	Denial of Service
DPD	Defense Plane Digest
DSSS	Direct Sequence Spread-Spectrum
DTN	Delay-Tolerance Network
DVB	Digital Video Broadcasting
DVB-S	Digital Video Broadcasting—Satellite
ECN	Explicit Congestion Notification
ETD	Entrance Traffic Digest
FHSS	Frequency Hopping Spread Spectrum
FSS	Fixed Satellite Service
GEO	Geostationary Earth Orbit
GMR	GEO-Mobile Radio
GNSS	Global Navigation Satellite System
GPS	Global Positioning System
GSE	General Stream Encapsulation
HAPS	High-Altitude Platform Station
HELLADS	High-Energy Liquid Laser Area Defense System
HTTP	Hypertext Transfer Protocol
IoT	Internet of Things
LEO	Low Earth Orbit
LiDAR	Light Detection and Ranging
MEO	Medium Earth Orbit
MIRACL	Mid-Infrared Advanced Chemical Laser
MISO	Multiple-Input Single-Output
ML	Machine Learning
MSNET	Mobile Satellite Communication Network
NFV	Network Function Virtualization
NMA	Navigation Message Authentication
NR	New Radio
NTN	Non-Terrestrial Network
OCS	Onboard Computer System
OPSPF	Orbit Prediction Shortest Path First
PD	Power Distortion
PHY	Physical Layer
PLA	People’s Liberation Army
PLS	Physical Layer Security
QKD	Quantum Key Distribution
QoS	Quality of Service
SAR	Synthetic Aperture Radar
SATCOM	Satellite Communication
SCA	Spreading Code Authentication
SCS	Satellite Communication System
SDN	Software-Defined Network
SDSN	Software-Defined Satellite Network
SDR	Software-Defined Radio
SLT	Secure LEO Trust
SM-3	Standard-Missile 3
SQM	Signal Quality Monitoring
SSL	Secure Socket Layer
STIN	Satellite–Terrestrial Integrated Network
SVM	Support Vector Machine
TDOA	Time Difference of Arrival
TESLA	Timed Efficient Stream Loss-Tolerant Authentication
TLS	Transport Layer Security
TOS	Type of Service
VoIP	Voice over Internet Protocol