I removed the Greek Fire and Damascus sword examples, since they're more properly considered examples of Lost Technology (and are already mentioned there, I believe). We understand the operating principles of fire and stabbing; we just aren't sure how to make these particular things.
Applied Phlebotinum is a thing useful in-'verse, but viewers can't make heads or tails of it. Black Box is a thing useful in-'verse, but its users can't make heads or tails of it.