Typography - What is a case fraction?

A case fraction is a fraction symbol that is typeset as a single character.

½


Other types of fraction:

This is a stack fraction. Also called a horizontal bar fraction or a vertical fraction.

1 2

This is an built fraction or built-up fraction. It uses at least 2 blocks of type. Also called an on-line fraction, because both numbers sit on the baseline.
The numerator and denominator are regular numerals separated by a forwardslash.

1/2


The term case may refer to the physical case in which the typesetting blocks were stored.
Upper case and Lower case containers for 18th century movable type.
By Maggie McCain (Flickr: PB103474) [CC BY 2.0], via Wikimedia Commons

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