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)
- The Creep System (13 members)
- The Fleurian System (57 members)
- The Nadurian System (42 members)
- The Nature Systems (141 members)
- The Quartz System (18 members)
- The Sylvian System (32 members)
- The Warrior System (12 members)
- Toyyic (15 members)
- Transgender (16 members)
- Transgender Flag (1 member)
- Transsexual (1 member)
- Turian (6 members)
- UIN (2 members)
- UNDIN (9 members)
- UNICIN (1 member)
- URIN (14 members)
- USIN (3 members)
- UXIN (13 members)
- Uingender (105 members)
- Umbrella Term (92 members)
- Unattributed files (0 members)
- Unidentified Flag (12 members)
- Ursinegender (6 members)
- Userbox (4 members)
- Userbox Template (1 member)
- Userbox templates (5 members)
- Userboxes (1 member)
- Utility Templates (2 members)
- Utility templates (1 member)
- VAIN (3 members)