| Clue | Source | Date |
|---|---|---|
| Secret or disguised ways of writing (7) | ||
| Enigmatic messages | Universal | 04 Oct 2022 |
| 0 0 0 | New York Times | 25 Aug 2019 |
| Coded messages | Wall Street Journal | 26 Jan 2019 |
| 0 0 0 | ||
| Coded messages | ||
| Big nothings | ||
| Coded messages | ||
| Coded messages | ||
| Converts to code | ||
| Coded messages | ||
| Zeros | ||
| Monograms. |