Guidonian hand
In Medieval music, the Guidonian hand was a mnemonic device used to assist singers in learning to sight-sing. Some form of the device may have been used by Guido of Arezzo, a medieval music theorist who wrote a number of treatises, including one instructing singers in sightreading. The hand occurs in some manuscripts before Guido's time as a tool to find the semitone; it does not have the depicted form until the 12th century. Sigebertus Gemblacensis in 1105–10 did describe Guido using the joints of the hand to aid in teaching his hexachord. The Guidonian hand is closely linked with Guido's new ideas about how to learn music, including the use of hexachords, and the first known Western use of solfege.
History of Western typography
The "Aldino" italic type, commissioned by Manutius and cut by Francesco Griffo in 1499, was a closely spaced condensed type. Griffo's punches are a delicate translation of the Italian cursive hand, featuring letters of irregular slant angle and uneven height and vertical position, with some connected pairs ("ligatures"), and unslanted small roman capitals the height of the lower case t. The fame of Aldus Manutius and his editions made the Griffo italic widely copied and influential, although it was not the finest of the pioneer italics. The "Aldino" style quickly became known as "italic" from its Italian origin.