# blackboard bold

> typeface, used in mathematics, that doubles certain lines of the symbol

**Wikidata**: [Q1142171](https://www.wikidata.org/wiki/Q1142171)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Blackboard_bold)  
**Source**: https://4ort.xyz/entity/blackboard-bold


## References

1. [Source](https://archive.org/details/webb-stephen-clash-of-symbols-a-ride-through-the-riches-of-glyphs/page/199/mode/1up)
2. Freebase Data Dumps. 2013