Pen tilt
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Template:One source Pen tilt refers to the angle of a writing instrument during handwriting and drawing, which can vary over time. In a coordinate system which is determined by the writing surface plane and the vertical pen-tip movement along the axis, all three two-dimensional planes can be discerned, and the angular signals can be delivered by a digitizer. It is part of the ISO/IEC standard 19794-7 for biometric data in signatures.[1]