Universal symbols have been used as a form of communication from the Bronze Age, when the dynasties of ancient Egypt began the evolution of the thousand characters used in Egyptian hieroglyphics. In pre-Columbian America the Mayan civilization set out on a similar course, using pictures as a narrative text.

With the adoption of written languages, symbols have come to represent an illustrated shorthand. The dollar sign in America evolved from colonists’ trade with the Spanish, and the widespread acceptance of Spanish currency in deals. Merchants’ clerks would shorten the repeated entry of “pesos” in their accounts ledgers, which needed to be written with a ‘p’ and an ‘s’. A single letter ‘s’ with the vertical stroke of the ‘p’ was much quicker. Historically correct dollar signs have a single stroke through the ‘S’.

Symbols are also used to impart quick, recognizable safety advice. The radio activity symbol was designed in Berkley in 1946 to warn of the dangers of radioact