sm

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Sm,

symbol for the element samariumsamarium
, metallic chemical element; symbol Sm; at. no. 62; at. wt. 150.36; m.p. 1,072°C;; b.p. 1,791°C;; sp. gr. 7.54 at 20°C;; valence +2 or +3. Samarium is a lustrous silver-white metal.
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Sm

(chemistry)

SM

1. Abbr. for “standard matched.”
2. Abbr. for surface measure.

sm

(networking)
The country code for San Marino.