later, keypads also bear letters according to the following system:

In the UK, dials and keypads also bore letters, though these were later dropped. They were arranged as follows:

Assigning the letter O to the zero makes sense, as in British speech, "oh" is often said rather than "nought" or "zero"; Q is visually similar to O, causing plausible confusion. Therefore, two possible mistakes were avoided.

These letter assignments have been used for multiple purposes. Originally, they referred to the dialable letters of telephone exchange names.

1.Previous
3.Next