JoAnne Klimovich Harrop Friday, Dec. 18, 2020 8:01 a.m. | Friday, Dec. 18, 2020 8:01 a.m. They are the universal symbols of the ... each has its own customs and meanings and ways to celebrate ...

Eventually, the plus and minus signs became universal, as did the English symbol for equality, but only after decades of famous mathematicians competing in these popularity contests to set the trends.

Map symbols show what can be found in an area. Each feature of the landscape has a different symbol. Contour lines are lines that join up areas of equal height on a map. By looking at how far ...