In the story I'm writing I have three constructed creatures that have been given life. If there were two, I would definitely call them "twins", but I don't want to call them "triplets" because to me that strongly suggests birth. I'm sure I've come across sets of more than two individuals referred to as twins, but I can't confirm this with Google, and I've had a couple of readers query it. Can anyone back this up? (Or suggest an alternative word?)