X or χ (the letter "chi") may refer to:
- Chi and the Recusant's Sigil, which are symbols represented by an X
- The χ-blade, a legendary weapon introduced in Kingdom Hearts Birth by Sleep
- Kingdom Hearts χ, a Kingdom Hearts game exclusive to PC browsers
- Kingdom Hearts Unchained χ, a Kingdom Hearts game exclusive to smartphones
- Hunter-X, a powerful enemy ship in Kingdom Hearts II
- Luxord, number X in Organization XIII
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