What does SX stand for?

Christman Air System - ICAO designator (AD)

Dollar Sign - Telegraphy (PCTE)

Essex (SAUS)

Greece - Civil aircraft markings - international (PIPO)

Kalashnikov - NCIC firearms make code (NCIC)

Pia Societas Sancti Francisci Xaverii pro Exteris Missionibus - St. Francis Xavier Foreign Mission Society - Xaverian Missionary Fathers - Roman Catholic religious order

Sacks

Scientific Extension (SAUS)

Secondary Instruction (SAUS)

Sex (SAUS)

Sheet Explosive (SAUS)

Sigma Xi - Society

Simplex - Transmission direction (CET)

Simplex Signaling (IAA)

Slow Crosstalk (SAUS)

Society of St. Francis Xavier for the Foreign Missions - Also known as Xaverian Missionaries (EAIO)

Solvent Extracted - Fuels and lubricants

Solvent Extraction (DEN)

South Georgia and the South Sandwich Islands - GeoNet country code (GEON)

South Georgia and the South Sandwich Islands - Federal Information Processing Standard (FIPS) country code (GEON)

Stability Index (FAAC)

Starch Xanthide (SAUS)

Sterling Philippines Airways, Inc. (SAUS)

Surgeries (DAVI)

Sussex - County in England

SXT Resources Ltd. - Vancouver Stock Exchange symbol

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Union of Soviet Socialist Republics - Later, FC - License plate code assigned to foreign diplomats in the US

Xaverian Missionary Fathers (TOCD)

Signs (DAVI)

Symptoms - Medicine (WGA)

South West Africa - Namibia - MARC country of publication code - Library of Congress (LCCP)

Suction - Surgery (DAVI)

Xaverian Missionary Fathers, St. Francis Xavier Mission Society (TOCD)