Classic Hammond spinets, certain consoles (including the H-100, E-100 etc) and many modern Hammond models have keys which in profile are shaped like a diving board. This is the 'standard' shape used by most organ and keyboard/synthesiser manufacturers but WaterfallKeys are preferred by non-classical Hammond players because DivingBoardKeys are harder to play slides (glissandi) on.
See also WaterfallKeys
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