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STM (plural STMs)
- (microscopy) Initialism of Scanning Tunneling Microscope.
- (publishing industry) Scientific, technical, and medicine
- (train control) Initialism of Specific Transmission Module.
- (transport) Initialism of Société de transport de Montréal.; the MTC; the transit corporation for the island and megacity of Montreal; in 2002 it replaced the STCUM.