Angel banishing sigil

The angel banishing sigil, once drawn in human or angel blood and a hand pressed at its center, sends out a fierce light that banishes any angels within its blast radius. This sigil does no harm to the angels, it merely sends them to a different location on earth, their vessels included. It also doesn't harm the vessels they occupy. This is, in a way, a weakness for the angels. Once the sigil is activated, the angel it is affecting, temporarily has its grace inactive, so that it is rendered mortal. As a result, it cannot fly back to where he or she was banished. They cannot stop it, once in use. It can be activated by both humans and angels (in human vessels); it does not banish the angel that activated it, unless the sigil was carved into his or her vessel's own flesh.

Appearances

 * Season 4
 * Heaven and Hell (by Anna, to banish Castiel and Uriel)
 * The Rapture (by Castiel, to banish Zachariah's minions)
 * Lucifer Rising (by Castiel, to banish Zachariah)
 * Season 5
 * Sympathy for the Devil (by Dean, to banish Zachariah and his cohorts)
 * The Song Remains the Same (by Sam, to banish Anna)
 * Point of No Return (by Dean to banish Castiel and by Castiel to banish Zachariah's minions and inadvertently himself)
 * Season 6
 * The Third Man (by Dean, to banish an unnamed angel)
 * Caged Heat (by Samuel to banish Castiel)
 * Season 7
 * Reading Is Fundamental (by Dean to banish Hester, her followers and Castiel)
 * Season 9
 * I Think I'm Gonna Like It Here (by Dean to banish two hostile angels, though the destination now might not be Heaven)
 * Heaven Can't Wait (failed attempt by Castiel to banish Ephraim)

History
Once Sam and Dean gain this knowledge, they frequently use it to defend themselves against angels.

Another variation
In Caged Heat, Samuel Campbell drew a modified version of the sigil and activated it, banishing Castiel temporarily. The sigil was different than the "standard version" of angel banishing sigil used.

Trivia

 * Sam and Dean first learned this from Anna Milton in Heaven and Hell, where she drew this symbol and banishes them for a while. Ironically they would later use it against Anna herself in The Song Remains the Same.
 * In some of the symbol's later appearances, the sigil had less intricate designs, but were shown to be just as effective.
 * So far they have used it at least once every season except season 8 since it was introduced.

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