Give at least one example of a regulatory sign.

Square with black lettering on a white background such as speed limit signs.  

Octagon, triangle, square with white lettering on a red background such as STOP, YIELD, DO NOT ENTER or WRONG WAY sign.  

Square with black and red symbols such as no U-Turn arrow sign.

that's just a list of some of  regulatory signs but there are so much more regulatory signs are just the signs that you see when driving

sex is when a male and female has intercourse (sexual)

loris malaguzzi was the founder of reggio emilia’s educational philosophy and together with the comune and many local administrators he participated in the birth and building of reggio emilia’s network of municipal preschools (3-6) and infant-toddler centres (0-3).