XAA
XAA may refer to:
Science
- Xaa, the abbreviation for an unspecified amino acid
- Xaa-Pro aminopeptidase, an enzyme
- Xaa-Xaa-Pro tripeptidyl-peptidase, an enzyme
Other uses
- ISO 639:xaa, Andalusian Arabic
- XFree86 Acceleration Architecture, an X Window System driver architecture
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