Upper and Lower Case

Upper and lower cases

I love this very literal word origin story. The terms uppercase and lowercase that we associate with the letters of the alphabet evolved directly from the physical storage system used by typesetters in the era of the movable-type printing press.

We go back to the days of Johannes Gutenberg in the 15th century. The movable type system in early printing meant that every single letter, numeral, and punctuation mark was cast as an individual block of metal, called a sort.

To compose a page of text, a typesetter (or compositor) had to pick out each sort one by one and arrange them backward in a frame.

To keep the hundreds of different sorts organized and easily accessible, printers stored them in compartmentalized wooden trays called type cases. Traditionally, the typesetter would use a pair of cases, which were set up on a working stand, often angled and stacked. The upper case, which was set above and behind the lower one, held the capital letters. Capital letters (which were also known as majuscule letters) are used far less frequently in English text, so they could be stored slightly further away.

The lower case, positioned below and closer to the typesetter, held the small letters (also known as minuscule letters) that make up the vast majority of any given text.

The arrangement of the letter compartments within the lower case was based on letter frequency. The largest compartments, and those closest to the typesetter, were for the most common letters, like 'e', 't', 'a', and 'o', saving the typesetter time and effort.

The terms became standardized and filtered out from the printing trade into general language around the 18th century, thankfully replacing the older, more technical terms of majuscule and minuscule.