The Didot family type foundry revised Pierre Simon Fournier le Jeune's system of type measurement and created the system, which divided a French inch into seventy-two points. Type size was identified by the measure of the metal type body in points. In 1886, the Didot system was revised to suit the English inch and adopted as a standard point measure by American type foundries.

pied de roi

Explanation:

The Didot family type foundry revised Pierre Simon Fournier le Jeune's system of type measurement and created the pied de roi  system, which divided a French inch into seventy-two points. Type size was identified by the measure of the metal type body in points. In 1886, the Didot system was revised to suit the English inch and adopted as a standard point measure by American type foundries.

pied de roi --- means king's foot

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