TouchStyk
Provided by the ASK Keyboard Dictionary
The TouchStyk is a force-sensing capacitor pointing stick introduced by Synaptics as a competing product to IBM's TrackPoint. It was invented by 2001. It's famously used for HP laptops with pointing sticks and even by IBM and Lenovo for their SK-8835/SK-884x family of keyboards. It's also possible some modern Lenovo ThinkPad keyboard assemblies also employ TouchStyks instead of TrackPoint as implied by Synaptics' advertising.