No thing, according to Wikipedia
Jeff: What is this? *points at thin air*
Brian: Nothing.
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It's actually a very rare kind of keyboard no longer being manufactured.
Unlike most keyboards, the PLUM keyboard organizes keys in a square grid, as opposed to the staggered rows of a typewriter.
It also goes up to the F15 key.
Layout:
PLUMtbCFGQ
READONTHIS
KJVB,.WXYZ
Where t is tab and b is backspace.
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