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Table 1 Visible states of gestures on two orthogonal planes

From: A conformal geometric algebra method for virtual hand modeling and interaction

Finger segment Grasp Pinch Hold
Thumb PP Y/N Y/N Y/N
Thumb MP Y/Y Y/N Y/Y
Thumb DP Y/N Y/N Y/N
Index PP Y/Y Y/Y Y/Y
Index MP Y/Y Y/Y Y/Y
Index DP Y/Y Y/N Y/N
Middle PP Y/Y Y/Y N/Y
Middle MP Y/Y Y/Y Y/Y
Middle DP Y/Y N/N Y/N