The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- Table templates (1 member)
- Tavaline System (14 members)
- Techgender (3 members)
- Techno-Gender System (10 members)
- Technogender (50 members)
- Template (7 members)
- Template documentation (52 members)
- Templates (33 members)
- Temporalgender (19 members)
- Terminology (705 members)
- Terms with problematic influence (5 members)
- Terra System (7 members)
- Terrariagender (5 members)
- Tertiary (1 member)
- Tertiary Identity (85 members)
- Texturagender (46 members)
- Thaumic (27 members)
- The Alibinary System (5 members)
- The Astrian System (15 members)