# up tack

> mathematical symbol; the bottom element in lattice theory; the bottom type in type theory; a logical constant denoting contradiction in logic (false)

**Wikidata**: [Q3594846](https://www.wikidata.org/wiki/Q3594846)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Up_tack)  
**Source**: https://4ort.xyz/entity/up-tack