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| Name | Type(s) | Game(s) | Series | Franchise |
| X-Potion | Item | Final Fantasy VII, Final Fantasy VII, Final Fantasy IX, Final Fantasy X | Final Fantasy | |
| X-Potion | Item | Final Fantasy VII | Final Fantasy, Final Fantasy VII | Final Fantasy |
| x64 | Terminology | |||
| X86 | Terminology | |||
| x86-64 | Terminology |
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