The pointing stick (trademarked by IBM as the TrackPoint) is an isometric joystick used as a pointing device (compare especially touchpad). It was invented by research scientist Ted Selker. It is present on many brands of laptop, including IBM's line of ThinkPad laptops (now made by Lenovo) and on Dell Latitudes under the name of Track Stick. It has also been observed on computer mice and on some desktop keyboards, such as the UltraNav. Pointing stick devices are sometimes informally referred to as a "nipple" , "eraser head", "clit-mouse", or "nub" .
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