Metal dome
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Metal dome is a type of keyboard switching technology that uses clicky domed discs of metal to provide resistance, tactility — and often the contact mechanism itself. The switches are often very thin.
The type of switch is most known for being used in 1970's pocket calculators, before rubber domes became more commonplace. It has in recent times been used in Apple Macintosh keyboards together with the Apple butterfly mechanism scissor mechanism.
Metal domes are still being widely used, either inside "Tact" switches, or soldered directly to the board for a very-low profile switch. The latter style is used in some mobile phone keyboards, and for the D-Pad of the Google Stadia controller.
