The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 23 (11 members)
- 3D (5 members)
- ? (12 members)
- AI (7 members)
- ASCII (57 members)
- Acronyms (3 members)
- Agriculture (6 members)
- Aliens (8 members)
- Alphabet (8 members)
- Anarchism (20 members)
- Anatomy (7 members)
- Animals (13 members)
- Antifa (4 members)
- Apache (4 members)
- Arduino (6 members)
- Art (56 members)
- Articles For Deletion (1 member)
- Artists (22 members)
- Ascii (3 members)
- Astronomy (29 members)