Summoning circle

A summoning circle is a circle used by sorcerers to summon entities from the spirit world. They are usually created by using salt or chalk.

Empath: The Luckiest Smurf stories
Gargamel has used summoning circles a few times in the EMPATH: The Luckiest Smurf story series, with one instance to summon Beelzebub to do his bidding in exchange for being his slave.