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The best guess I could find online about these with 5min search Sorry for r*ddit
Although, I think safety matches are ones that will only strike on the rough side of the box, rather than a wall or chin stubble.
But I rather like the idea that they have matches that don’t burn all the way down. https://www.britannica.com/science/safety-match
Also describes half the d&d groups I’ve DM’d