| Answer | Crossword Clue |
|---|---|
| ZIP | ... code (number on a letter) |
| ZIP | Code on a letter |
| ZIPCODE | Number on a letter |
| AREA | ... code (part of a phone number) |
| AREA | ... code (part of a telephone number) |
| XTRA | Code word for a letter |
| ALFA | Code word for the letter "A" |
| DIT | Part of a Morse code letter |
