This whole greek "elements" thing is hopelessly confusing:
Firstly, very few people are familiar with the symbols
Secondly, the symbols are far too complicated
Thirdly, the symbols are weirdly distorted in the current suggestions
Fourthly, the names (esp. "fire") are going to to be very confusing when writing instructions
Fithly, the second coloured lines are extremely non-obvious in thier meaning
Sixthly, the only link beween the positions and the labels is the shape of the symbol, which nobody knows.
Seventhly, if we're going to make people learn a set of essentially arbitrary symbols, we should be able to come up with much better ones than these.
Eight-oh-whatever-I'm"sure-you-can-count-thly using an empty space (aka "void") as a button label is a really horrible idea, for obvious reasons
I'm personally irritated by the use of classical "elements". They're straightforwardly Wrong! If we must be using element symbols, can't we use Dalton's?
https://upload.wikimedia.org/wikipedia/commons/9/97/A_New_System_of_Chemical_Philosophy_fp.jpg
They may be less classical, but they're also 100% less misguided.
xkcd 965