Letters and numbers can be used together to represent 2 dimensions, but this may create confusion about which represents the quality of evidence and which represents the balance between benefits and ...

Previously, the family number would be six digits (for example, 123456), but will now include one letter and five numbers (e.g. A12345).

Old phone numbers in the U.S. had letters to denote the telephone exchange that handled any given number, a practice that lasted until the late 1970s.

These were combined to create individual numbers—for example, MA meant 41, and PNE meant 155. After they ran out of alphabet, a small comma-like tail at the lower left of a letter between Α and ...