I remember we weren't big on "singleton" because it felt sort of patronizing, if that makes any sense. Someone pointed out once that it was too close to "simpleton," and it feels to me like the intuitive counterpart to "multiple" is "single," because people don't say "multipleton." But everybody reflexively rejected the use of that, it seemed, because it's used so frequently to refer to people's relationship status? Eh, not to get all Sapir-Whorf Bullshit Trans Word Police on anyone, or anything.

-Riel