3 ms·Begs the question why the symbol for a limit is in the (literal) shape of a target.by everfrustrated 1y agoBegs the question why the symbol for a limit is in the (literal) shape of a target.4ndrewl 1y agoCircular signs with a red outline are prohibition signs (ie you _must_ not do this). Triangular signs with a red outline are warning signs.tengwar2 1y agoCircular blue signs are orders (i.e. you must do this).