Basic terms

• XR
• Virtual Reality (VR)
• Augmented reality (AR)
• Mixed Reality (MR)
• Base Reality (Natural, Physical, Meat, Real, etc.)

Other

• FOV Field of View
• Spatial Computing
• Sensor (include examples)
• HMD (Head Mounted Display)
• Head Tracking
• HeatMap
• Geo Spacing
• Telemetry 
• Blind Spot
• Biometric data
• Gaze data
• Voice UI
• (From ross Newman)
• Eye Tracking
• Face Tracking
• Pose/Gesture Data
• Gait Analysis
• Gait Pattern
• Computer Vision (CV)
• Optical Flow
• Meatspace
• Landmark (CV/AR)
• (AR Cloud)
• Geo Pose
• Point Cloud
• Personas
• Localization
• Relocalization
• Spatial
• Spatial Awareness
• Presence
• (we can also build upon some of our OARC Glossary https://github.com/OpenArCloud/OpenGlossaryForRealWorldSpatialComputing/wiki/Pose---GeoPose)
• Space
• EEG (Electroencephalography)
• MMG (Mechanomyogram)
• Virtual Being
• Digital Twin
• Placing
• Spatial Sound
• Spatial Mapping
• Haptics
• Hand tracking 
• Volumetric Capture/Video
• Blockchain
• Cryptocurrency
• Human-computer interaction (HCI)
• User interface (UI)
• Input device
• Degrees of freedom (DOF)
• Output device
• Interaction technique
• Usability
• User experience (UX)
• UX evaluation
• 3D Interaction
• 3D user interface (3D UI)
• Virtual Environment
• Virtual Collaboration/Coworking
• Ubiquitous computing (UbiComp)
• Telerobotics
• WebXR - WebAR + WebVR
• 360 video (as another category different from AR,VR,XR,MR)
• AI
• 5G
• Machine Learning
• OpenXR
• Immersive entertainment/Hyper-reality/Location based XR for e.g. The VOID, Onedome, etc.
• Active Response Gravity Offload System
• Brain Computer Interface (BCI)
• Dark UX
• Dark Patterns
• Metaverse
• Mirror World
• Multiverse
• Photogrammetry
• Cyber sickness
• SLAM
• Motion Tracking
• Motion Capture
• Light Field capture
• CAVE (Cave Automatic Virtual Environment)
• Inside-out tracking
• Outside-in tracking
• Parallax
• Stereoscopy
• Room scale
• Latency
• Locomotion
• OpenGL
• WebGL
• Foveated Rendering
• Mesh
• Presence
• Immersion
• Telexistence
• Telepresence