noun

• (microscopy) Initialism of scanning tunneling microscope. [A device used to form an image of the surface of a conductor or semiconductor with atomic resolution.]
• (train control) Initialism of specific transmission module.
• (publishing industry) Initialism of scientific, technical, and medicine.
• (physical therapy) Initialism of soft tissue mobilization.
• (cognitive science) Initialism of short-term memory. [(psychology) The capacity for holding, but not manipulating, a small amount of information in mind in an active, readily available state for a short period of time.]