rules, regulations, customs, law
Depicts a kind of drawing tool for drawing circles with. The 見 (see) component was later added to suggest watching something being drawn. Based on the original meaning "compass; a kind of drawing tool", now written as 槼. The meaning has shifted over time and now means "rules".
《說文》：“規，有法度也。从夫，从見。”
compass; a kind of drawing tool