Design Feature:
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(1) Armillary spheres, planetaria, astronomic orbits, atomic models, molecular models
(2) Cog wheels, wheel cogs
(3) Binoculars, telescopes, field glasses, microscopes
(4) Magnifying glasses with handle
(5) Instruments for linear measurement (yardsticks, graduated rulers, tape measures, surveyors' tapes and chains)
(6) Compasses for draftsmen and masons
(7) Horseshoes, horseshoe-shaped magnets (other magnets see 15.9.16)
(8) Letters or numerals representing a figurative element
(9) INSCRIPTIONS IN GREEK CHARACTERS
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