Technical lettering

used in technical drawing
freehand or mechanically aided (lettering guide, CAD)
height commonly 1/8 inch; when freehand, regulated by very light guidelines
series of short strokes
gothic sans-serif
sources: http://www.hhs.helena.k12.mt.us/Teacherlinks/Holmesl/Unit_3_Text.rtf, http://www.personal.kent.edu/~rbavis/lettering.htm, http://www.tpub.com/engbas/3-27.htm, Technical Drawing 13th edition