The categories:

Examples are a guide and should not be considered an exhaustive list of eligible products

Accessory
Products that are added to, or used alongside other AV technologies, to help them function, make them more useful or fine tune them.
Some examples: Brackets and mounts, projection screens and specialist furniture.

Audio (non-loudspeaker)
Technologies that handle audio capture, storage, distribution or processing.
Some examples: Microphones, intercom, congress systems, amplifiers, mixing consoles, players, and DSPs

Communication and collaboration
Technologies that are purely focused on supporting communication and collaboration whether local or remote.
Some examples: VC platforms, beamforming microphones, interactive displays, conferencing peripherals, congress systems, screen sharing products

Control
Technologies that allow users to control spaces as well as software that supports remote control, maintenance and monitoring.
Some examples: Control panels, monitoring and scheduling software, control processors, control apps, analytics platforms

Display (end point)
Any visible display technology.
Some examples: Projectors, LEDs, LCDs

Events Technology
Technology that can be used for events large or small.
Some examples: LED displays and projection, loudspeakers, microphones, event control, mixing consoles, image processing, intercom and lighting

Loudspeaker
What else can we say… loudspeakers!
Some examples: Line arrays, point source loudspeakers, monitors, ceiling speakers, column speakers

Signal distribution and processing
Technologies for getting signals from A to B, as well as those that deliver switching, processing and scaling capabilities.
Some examples: AV-over-IP products, signal extension, matrix switchers, media players, scalers, image processors, KVM products

Streaming Technology
Technology for capture, broadcast and storage of video streams. 
Some examples: Cameras, encoders/decoders, video production tools, lecture capture platforms, streaming platforms, video storage, IPTV