XA

XA stands for Extended Architecture
XA stands for Activated Factor X
XA stands for Extended Attribute
XA stands for Extensible Architecture
XA stands for Exchange Access
XA stands for Chi Alpha Campus Ministries, USA (Assemblies of God secular college & university student outreach)
XA stands for Exclusion Area (military)
XA stands for Exiled Alliance (gaming)
XA stands for Harley-Davidson World War II shaft drive military motorcycle model
XA stands for XRay Angio
XA stands for Expanded Architecture
XA stands for Secretariat/Executive Agents