XR
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XR is an acronym not yet used for much. Perhaps you where looking for the Chi-Rho monogram of christ: labarum.
XR may also mean extended release in certain medications, for example Adderall XR
XR can also mean eXchange Rate based on how it is used on some websites, e.g. XR calculator, XR data feeds, XR transactions, source: exchangerate.com.