AR	Augmented reality
I4.0	Industry 4.0
XR	Extended reality
BIM	Building data modeling
LED	Light-emitting diode
RL	Reinforcement learning
CPS	Cyber-physical system
MR	Mixed reality
HMD	Head-mounted display
ROS	Robot operating system
UV–Vis	Ultraviolet-visible
DNA	Deoxyribonucleic acid
SDK	Software development kit
CNNs	Convolutional neural networks
MEC	Mobile edge computing
OST	Optical see-through
VST	Video see-through
PPO	Proximal policy optimization
SIFT	Scale-invariant feature transform
SURF	Speeded-up robust features
ARML	Augment reality markup language
WSN	Wireless sensor network
WBAN	Wireless body area network
GAN	Generative adversarial network
MADDPG	Multi-agent deep deterministic policy gradient
DDPG	Deterministic policy gradient
MSE	Mean squared error