Helix

That's true, and pretty interesting. Now we think of life in two ways: "life as we know it (us)" and "alien (not us)". What if some alien species used triple, quadruple or even hexagonal (I'm not using the word correctly, I'm aware. The real word slipped my mind) DNA. This would blur the line for sure, and they would be far more complex (3,4,6-times the complexity of our genes. But back on topic, and to answer the initial question, they do exist. Now I am wondering if they can help with diseases like cancer..?

Yeah i noticed my gaff about 20 minutes ago while thinking about oglionucliotides. Which brings me to: yes that is correct to the point of "before conjunction." I think after the triple helix is created it keeps the name. At least, I was getting at the oglionucliotides function, which answers the inital question.

Yes triple helix can, and does, exist. It is akin to adding half a ladder to a whole one. In fact oglionucliotides, the name for triple helixes, are being used extensively in anti-cancer therapys. Because a triple helix cannot be copied, scientists are trying to turn the mRNA of mutant genes into a triple helix in order to silence it. Also has some bearing to iRNA and siRNA, a biological mechinism that silences mRNA that is overexpressed.