Celtic Sigil Trap
From Super-wiki
Celtic sigil traps are sigils that can be used to trap creatures. One version of the sigil trap is a is a variation of the triquetra, or Celtic trinity knot. For the spell to work, it consists of two sigils painted a distance apart, for example on opposite sides of a room. When one is activated by applying blood to the sigil, the person or creature located between the sigils will be forcibly drawn to the other and trapped there.
Episodes
11.11 Into the Mystic
Eileen Leahy learned about a sigil spell from the hunter who raised her, Lillian O'Grady. She uses it to trap Sam when she thinks he is a banshee. Later she and the Winchesters use it to catch the real banshee.
