I'm referring to the numbers when people refer to a keyboard as being "75%" or "60%". Is the whole keyboard scaled down to 75% size, like the keys are 75% as big as normal, or is this just referring to the size in relation to a full size keyboard (so, something like a tenkeyless would be 80% as big as a normal board, and a 75% or 60% compact board would be similarly smaller)? Thanks.