Recusant's Sigil

"As your flesh bears the sigil, so your name shall be known as that...of a recusant."

—Xemnas to Sora

" You've been on a path, one we laid out for you. That sigil on your chest is the proof. See? That sigil, the X, it tells us where you are at all times."

—Young Xehanort to Sora

The Recusant's Sigil (異端の印, Itan no shirushi, lit. "Mark of heresy") is a symbol designed by Xehanort to represent the rejection of a Nobody from his original persona. It is incorporated into the new names of each of the original members of Organization XIII, and is derived from Xehanort's sleeping memories of the χ-blade.

In order for Xehanort to track his movements in the Sleeping Worlds, Sora was marked with the Recusant's Sigil, which took the form of a silver "X" on his shirt.