Pentacle

This is a magical seal, used to close a container and prevent the escape of a creature trapped inside. Typical uses are on doors and efreet bottles.

Magic Circle

This diagram protects against all devils and all creatures of good alignments from the Outer Planes.

Thaumaturgic Triangle

This symbol protects against creatures from the Elemental and Astral Planes, as well as the plane of Concordant Opposition.

Thaumaturgic Circle

This diagram protects against demons types I-V, including succubi, as well as all creatures affected by a Thaumaturgic triangle.

Pentagram

This diagram protects against evil and other-planar beings (except devils) but including all types of demons.

Magic (Protection) Circle

This diagram protects against lesser devils or hostile sendings. The circle of protection is different from the "protection from evil" spell. The spell provides bonuses to character saving throws against attacks from other-planer beings as well as a -2 modifier on the attacks of such creatures. The protection is not as complete as that of the diagram, but the spell can be used against all types of other-planar creatures.