In the United States, gunpowder grains were designated F (for fine) or C (for coarse).

The complex consists of three towers, which during construction were designated A, B, and C in the architectural plans.

With a frequency around 261.626 Hz, middle C is designated C in scientific pitch notation because of the note's position as the fourth C key on a standard 88-key piano keyboard.

The four temples, originally designated by the letters A, B, C, and D, front onto a paved street, which was reconstructed in the imperial era, after the fire of AD 80.

There are only four letters in the code's alphabet, designated C, G, A and T, which stand for four nucleic acids: guanine, cytosine, adenine and thymine.

The human fibulin-1 gene, FBLN1, encodes four splice variants designated fibulin-1A, B, C and D, which differ in their carboxy terminal regions.

The competition was assessed by a ground jury composed of five judges placed at locations designated E, H, C, M, and B. Each judge rated the competitors' performances with a percentage score.

A non-gangwayed Corridor Composite of this type, designated "C" (as opposed to CK for the gangwayed version), is preserved at the Keighley and Worth Valley Railway.

Links were designated A, B, C, and J for Junctor.

On many modern personal computers, only one hard drive with one partition is present, so it is designated C:.