Originally Posted by Mollers
Let's keep in plain and obvious in a warning sign style. Snakes and stuff just confuse the issue.
Red triangle is good (maybe made of kill cord?) - we all know it's a warning. The Kill Cord, despite having "kill" in the name is a good thing, so perhaps no snakes?
in the triangle with Clip it on!
That takes in a lot of the ideas suggested above. BTW - the word "Kill" in a logo is going to get attention in itself. Non boaters will ask what it means. Any boat user will recognise the name and image. The concept translates well into stickers, clothing and signage.