- the top of a mans penis, or a hermaphodites penis I guess as well. Also reffered to as a purple helmet.
- A condom, as worn on the head of your penis, perhaps a more accurate term.
- A kevlar, or plastic covering for your less important head, as worn while riding a motorcycle or visiting a construction site. Or oddly, enough, while exploring actual caverns. See [spelunking].
* These videos are coming directly from Youtube, they may or may not be most relevant to the word "Helmet"