ACO	Ant Colony Optimization
AI	Artificial Intelligence
AP	Access Point
AR	Augmented Reality
AWS	Amazon Web Services
BBR	Bluetooth Basic Rate
BC	BlockChain
BLE	Bluetooth low energy
CCTV	Closed Circuit Television
CAUDHT	Contact tracing Application Using a Distributed Hash Table
CN	Cellular Network
CNN	Convolutional Neural Networks
DP-3T	Distributed Privacy-preserving proximity tracing
DSS	Decisional Support System
ECDH	Elliptic Curve Diffie-Hellman
EDR	Enhanced Data Rate
ENACT	Encounter-based Architecture for Contact Tracing
FHSS	Frequency Hopping Spread Spectrum
FMD	Face Masked Dataset
FPN	Feature Pyramid Network
GDP	Gross Domestic Product
GDP	General Data Protection Regulation
GPS	Global Positioning System
IoT	Internet of Thing
IPM	Inverse Perspective Mapping
ISM	Industrial Scientific Medical
ITC	Information Technology and Communications
LIDAR	Light Detection and Ranging
MAC	Media Access Control
MERS	Middle East Respiratory Syndrome
MILP	Mixed Integer Linear Programming
MIOU	Mean Intersection Over Union
MSC	Mobile Switching Center
MMD	Medical Mast Dataset
MS COCO	Microsoft Common Objects in Context
NHS	National Health Service
NFC	Near-Field Communication
NIST	National Institute of Standards and Technology
NMT	Nomadic Mobile Telephone
NTP	Network Time Protocol
PACT	Privacy-Sensitive Protocol and Mechanism for Mobile Contact Tracing
PBC	Public BlockChain
PBN	Public BlockChain Network
PEPIN-PT	Pan-European Privacy-Preserving Proximity Tracing
PIR	Passive Infrared Sensors
PHY	Physical Layers Extensions
POC	Proof of Consensus
PoW	Proof of Work
PSO	Particle Swarm Optimization
PPC	Privacy-Preserving COVID-19 Contact Tracing App
QR	Quick Response
R-CNN	Region-based Convolutional Neural Networks
RF-CNN	Recurrent Fuzzy Coupled Cellular Neural Network
RSSI	Received Signal Strength Indicator
SARS	Severe Acute Respiratory Syndrome
SIG	Special Interest Group
DVD	Simulated Masked Face Dataset
SORT	Simple Online Real-Time Tracking
SRCNet	Super-Resolution and Classification Networks
SSD	Single Shot Detector
SSID	Service Set Identifier
STK	Short Term Keys (STK)
TCN	Temporary Contact Number
TDOA	Time Differential of Arrival
TOA	Time of Arrival
Wi-Fi	Wireless Fidelity
WHO	World Health Organization
RFID	Radio Frequency Identifier
RNN	recurrent neural network
WEP	Wireless Equivalent Privacy
UWB	Ultra-Wide Band
VR	Virtual Reality