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Reference.org
Isomorphic keyboard
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<p>An isomorphic keyboard is a musical <a href="/facts/Input_device/TXYLUkux">input device</a> consisting of a two-dimensional grid of note-controlling elements (such as buttons or keys) on which any given sequence and/or combination of <a href="/facts/Interval_(music)/aFwkkgpY">musical intervals</a> has the "same shape" on the <a href="/facts/Musical_keyboard/Mz0FGAe4">keyboard</a> wherever it occurs – within a key, across keys, across octaves, and across tunings. </p>