The earliest known drawing in human history – a red, cross-hatched pattern that looks somewhat like a hashtag – has been unearthed on a rock in South Africa.

Blombos Cave drawing with ochre pencil on silcrete stone. Craig Foster. The crisscrossed pattern, drawn on stone 73,000 years ago, wasn't used as shorthand for #artlovers, but the hashtag-like ...

Learn to recognise different circuit symbols with these interactive learning resources for KS2 Science students aged 7-11 from BBC Bitesize. ... Symbols are simplified drawings.