What does XO stand for?

360 (Degrees) Communic - NYSE symbol

Cross-Office (SAUS)

Crystal Oscillator (IEEE)

Exactly Once - AppleTalk Transaction Protocol (MLEX)

Examination Officer (SAUS)

Exchange Order - Travel industry (TRID)

exchange-order (SAUS)

Executive Office (SAUS)

Executive Officer - Military

Exercise, Operational (SAUS)

Exonerate - Telegraphy (PCTE)

Expenditure Order - Military (AABC)

Experimental Officer - Also, EO, ExO - Ministry of Agriculture, Fisheries, and Food - British

Extra Old - Designation on brandy labels

Orbiter Structural Body Reference, X-Axis (SAUS)

Presence of Only One Sex Chromosome - Medicine (EDAA)

Rio Airways - ICAO designator (AD)

Turner's Syndrome - Medicine - Sex-chromosome abnormality (EDAA)

Xanthine Oxidase - Also, XOD - An enzyme

X-Axis of Orbiter - NASA (NASA)

Xylenol Orange - An indicator - Chemistry