tactile map symbol_open circle

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.