Equal by definition approximately equal. X capital X a variable. Emblem token or sign.
The Symbol of Death Another theory is that the X signifies death.
The journey into the ultimate unknown. NYSE and AMEX listed stocks have three characters or less. Texe Marrs says it is used a symbol for the Egyptian deity Osiris because you see it in Egyptian pyramids and temples while we find pharaohs buried with their arms and legs crossed in devotion to this sun god. Originally these icons consisted of ASCII art and later Shift JIS art and Unicode art.