They're aerial root nubs, which is how rubber trees become banyans. Google image search has some great pics of what the trees can become, but unless it is very warm and VERY VERY humid in your home, they'll probably dry out soon. No harm in clipping them off or keeping them, as you like.

Only the first picture shows shoot initials.

Ahh that would make sense, I've been a bit overzealous with my misting recently!