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Normally it is = which is an equality sign
It wasn't an English man but it was a Welsh mathematician by the name of Robert Recorde who in 1557 invented the equality symbol and it has 2 equal parallel lines
An equation consists of two expressions, one on either side of an equality symbol.
The inequality degenerates to an equality, with significant loss of information.
It should have a three horizontal parallel lines but often the ordinary equality symbol "=" is used.