Definition of "SPM"

(microscopy, uncountable) Initialism of scanning probe microscopy.  examples

(microscopy, countable) Initialism of scanning probe microscope.  examples

(biology, countable) Initialism of suspended particulate matter.

(economics, countable) Initialism of supplemental poverty measure.  examples

Initialism of subpostmaster.  examples

(education, Malaysia, uncountable) Initialism of Sijil Pelajaran Malaysia. (Malaysian Certificate of Education, certificate for secondary school students in Malaysia)  examples