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Plant stem, the above ground axis of a vascular plant.

STEM fields (Science, Technology, Engineering and Mathematics).

Stem (linguistics), the base part of a word not including inflectional morphemes.

Stem (music), a part of a written musical note.

Stem (skiing) is a technique in skiing.

A Stem (bike) is the forward extension which connects the fork to the handlebars of a bicycle.

Stem (ship), the upright member mounted on the forward end of a vessel's keel, to which the strakes are attached.

Scanning transmission electron microscope.