What does SDX stand for?

Satellite Data Exchange

Sedona - Arizona - Airport symbol (OAG)

Sedona, AZ - Amtrak Busline code

Sibu - Language code (ETLW)

Sigma Delta Chi - Fraternity (NTCM)

Sigma Delta Chi Foundation (EA)

Stampeder Exploration Ltd. - NYSE symbol (SAG)

Storage Data Acceleration - Computer science (IGQR)

Stromberg Datagraphix (SAUS)