Scissor
A scissor is when a finger extends to the far side of the keyboard at the same time as an adjacent longer finger flexes to the near side.
In colloquial use, scissors refer to a wide variety of motions that are considered uncomfortable, including some that do not fit the definition above. However, there is significant disagreement on which scissors are considered “bad.” The proportions of finger lengths vary from person to person as does each person’s ability to move each finger independently of the others.
Some examples of common scissors on QWERTY include:
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