Online Encyclopedia of Western Signs and Ideograms Symbols.com

Symbol 18:20

1820

18:20 · The wavy arrow is a common sign for sea currents on map and nautical charts, etc. Sea currents are also represented by the signs 1608 and 0421.
    The ideogram 1820 is a combination of the sign for water, 0212a, and 0419, the sign for directed movement.