| Clue | Source | Date |
|---|---|---|
| Character on poison warning stickers | Wall Street Journal | 09 Aug 2025 |
| Symbol of poison on a warning label | New York Times | 25 Jan 2023 |
| Green, frowning symbol of poison prevention | Jonesin | 15 Oct 2019 |
| Iconic green poison symbol | New York Times | 14 Apr 2016 |
| Frowning symbol of poison prevention |