X or χ (the letter "chi") may refer to:
- The χ-blade, a legendary weapon introduced in Kingdom Hearts Birth by Sleep.
- The Recusant's Sigil, which is represented by an X.
- Luxord, number X in Organization XIII.
- Subject X, a mysterious girl first mentioned in Kingdom Hearts III.
- Kingdom Hearts χ, a Kingdom Hearts game exclusive to PC browsers.
- Kingdom Hearts Union χ, a Kingdom Hearts game exclusive to smartphones.
- χ3, a community feature in Kingdom Hearts Union χ.
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