The Galileo
The gal or galileo is defined as 1 centimeter per second squared (1 cm/s2).
This unit of measurement was named after Galileo di Vincenzo Bonaiuti de' Galilei.
The International System of Units considers the gal to be deprecated.
The proper spelling of the unit name "gal" is with all lowercase letters, unless it begins a sentence. This is to avoid confusion with the unit's symbol "Gal" which is spelled the same but has a capital letter.
A 1640 portrait of Galileo di Vincenzo Bonaiuti de' Galilei.