| Answer | Crossword Clue |
|---|---|
| ZIP | Code on a letter |
| ZIP | ... code (number on a letter) |
| XTRA | Code word for a letter |
| ALFA | Code word for the letter "A" |
| DIT | Part of a Morse code letter |
| PIN | Code entered on a keypad |
| ORD | Code on a bag to Chicago |
| CEEB | ... code (identifier on a SAT score report) |
| NOSHOES | Part of a dress code stipulation on convenience store signs |
| ISBN | Code on the inside of a book cover, for short |
