What does XOS stand for?

Cross-Office Slot - Telecommunications (TEL)

Experimental Operating System (SAUS)

Extra Outside (or Outsize) (SAUS)

Extra Outsize - Clothing

Str. Prd. Amex. Semicond. 2005 TIERS - AMEX symbol

Xerox Operating System

Xhosa - Language code (ETLW)

extra outside clothing (SAUS)