Seven-segment display character representations

The various shapes of numerical digits, letters, and punctuation on seven-segment displays is not standardized by any relevant entity (e.g. ISO, IEEE or IEC).

In Unicode 13.0, 10 codepoints had been given for segmented digits 0–9 in the Symbols for Legacy Computing block: In addition to the ten digits, seven-segment displays can be used to show most letters of the Latin, Cyrillic and Greek alphabets including punctuation.

[2][6][7][8][9] However, this modern scheme was not always followed in the past, and various other schemes could be found as well: For the remainder of characters, ad hoc and corporate solutions[clarification needed] dominate the field of using seven-segment displays to show general words and phrases.

Such applications of seven-segment displays are usually not considered essential and are only used for basic notifications on consumer electronics appliances (as is the case of this article's example phrases), and as internal test messages on equipment under development.

They give a good illustration of an application where a seven-segment display may be sufficient for displaying letters, since the relevant messages are neither critical nor in any significant risk of being misunderstood, much due to the limited number and rigid domain specificity of the messages.