| Clue | Source | Date |
|---|---|---|
| Very small length measurement | ||
| 10 to the centimeter | ||
| 0.039 inches | ||
| Metric unit about the thickness of a credit card | USA Today | 04 Dec 2023 |
| Thickness of a credit card, roughly | Wall Street Journal | 07 Jul 2020 |
| About .04 inches | ||
| Very small measure of length |