The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- fuel cell electric vehicle (2 members)
- Non-governmental Organization (2 members)
- Enumeration (6 members)
- volume (0 members)
- ambient thermal energy transfer (0 members)
- Demontageprozess (0 members)
- Measurement (0 members)
- motorcycle (0 members)
- gram per cubic centimeter (0 members)
- Big Map Lab Recipe (1 member)
- volatile organic compound (2 members)
- gaseous combustion fuel (9 members)
- million ton of coal equivalent (0 members)
- Filter (0 members)
- Transmission Electron Microscope (0 members)
- OEP study factsheet (0 members)
- Process (7 members)
- Funding Call (0 members)
- data preprocessing (0 members)
- Unit of Measure (1 member)
- ship (2 members)
- megajoule (0 members)
- energy storage function (5 members)
- program parameter (0 members)
- mole fraction (0 members)
- energy balance sector division (0 members)
- tunnel (0 members)
- electricity import (0 members)
- fluid (10 members)
- contract (0 members)
- quantity value (22 members)
- Furnace Characteristic (4 members)
- tube collector (0 members)
- chemical energy storage function (0 members)
- Grips (0 members)
- sulphur dioxide (0 members)
- acre (0 members)
- emission price (2 members)
- momentum unit (1 member)
- negative emission (0 members)
- Particle Radius (0 members)
- My Special Event Type (1 member)
- gas fired power unit (0 members)
- diesel car (0 members)
- megawatt-hour (0 members)
- redox reaction (2 members)
- Foundation (0 members)
- half life (0 members)
- milligram per square meter (0 members)
- Aging Temperature (0 members)