tactile map symbol_open circle
thingiverse
open circle point symbol from R. Rener (1993) Tactile cartography: another view of tactile cartographic symbols, The Cartographic Journal, 30:2, 195-198 One of the five point symbols Rener found listed in at least three studies as well readable for people with visual impairments. This shape has a rounded top surface. Originally designed to be .5 cm in diameter.
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