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Botts dots

[bots]
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plural noun Slang.
  1. small, protruding, reflecting ceramic tiles used on some roads instead of painted lines to mark lanes.

Origin of Botts dots

after Elbert D. Botts (born 1893), U.S. chemist, who developed them
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018