(inorganic chemistry) The inorganic compound Na₂S₂O₅, used as a food preservative, in photography and in many industrial applications

Alternative spelling of sodium metabisulfite

(inorganic chemistry) The sodium salt of hydrobromic acid (chemical formula NaBr)

(inorganic chemistry) The sodium salt of chloric acid (chemical formula NaClO₃).

(inorganic chemistry) The sodium salt of hydrocyanic acid, NaCN.

Alternative spelling of sodium sulfide

(inorganic chemistry) The inorganic compound Na₂S.

Alternative spelling of sodium bisulfate

(inorganic chemistry) The inorganic compound NaHSO₄, used primarily to lower pH.

A system resembling sonar but used in the air, for meteorological measurements, rather than in water.