From the sign that points you to the bathroom to the one that lets you know the floor is wet, you can thank the International Organization for Standardization for the designs. The standards make international symbols clear.
Unfortunately, that means they have to cover a lot of things, and some are completely horrifying. We combed through all 4,469 graphical symbols and found the ones most likely to make you shake with fear.
1. Warning; Unstable cliff edge

2. Warning; Boating area

3. Warning; Floor-level obstacle

4. Warning; Hand crushing between press brake tool

5. Warning; Falling objects

6. Warning; Crocodiles, alligators

7. Warning; Deep shelving beach

8. Warning; Crushing

9. Warning; Deep water

10. Warning; Submerged objects

11. Warning; Unprotected edges

12. Warning; Unstable cliff

13. Warning; Explosive material

14. Warning; Quicksand or mud/deep mud or silt

15. Warning; Bull

16. Warning; High surf or large breaking waves

17. Warning; Shallow water (diving)

18. Warning; Run over by remote operator controlled machine

Trivia Happy author Phil Edwards is now writing for Vox. You'll find new amazing stories there.
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