Word: triradius
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Then there are five places where the normal palm shows what researchers call a triradius-a wide-open letter Y formed by the junction of three lines. The crucial one is the axial triradius; on most palms it is just above the first flesh crease where hand joins wrist. If, in both hands, it is higher up, closer to the fingers, it may indicate inborn abnormalities from rubella or other causes...
British researchers measure the angle between the axial triradius and those at the base of the index and little fingers. The normal angle is around 48°; the higher the axial triradius, the larger the angle-around 80° in mongolism, and still greater in some of the other chromosomal abnormalities...