PARALLEL LINES IN EVERYDAY LIFE ARE EVERYWHERE see slideshow below
Do you know the HISTORY of the EQUAL sign??
Before the equal sign came into popular use, equality was expressed in words. According to Lankham, Nachtergaele, and Schilling at University of California-Davis, the first use of the equal sign (=) came in 1557. Robert Recorde, a circa 1510 to 1558, was the first to use the symbol in his work "The Whetstone of Witte." Recorde, a Welsh physician and mathematician, used two parallel lines to represent equality because he believed they were the most equal things in existence. The etymology of the word equal is from the Latin word aequalis, meaning "uniform, identical, or equal," from aequus "level, even, just." The symbol '=' was not immediately popular. The symbol || was used by some and æ (or œ), from the Latin word aequalis meaning equal, was widely used into the 1700s.