
Simply amazed that the existence of a 
symbol that is long enough. In the world of science course, this 
symbol is used for the first time in 1753 by the author of the book Species Plantarum. Previously, the 
symbols that express 
male and 
female was found on ancient relics in the prehistoric era.
Before there was writing, prehistoric peoples using pictures and symbols to "communicate". The experts tried to find a relationship why these 
symbols are used to indicate 
male and 
female.
Some say the sign of the circle and arrows indicate that men at the time were known as hunters armed with spears, while the 
symbol of a circle with a cross below it, as the 
depiction of women, shows that 
women have a tendency to mirror (the 
symbol is analogous to a mirror-handled).
But there is also a mention that the 
symbols that have experienced changes since long, which is derived from the human physical form 
men and 
women.