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2. AC adapter - Wikipedia

   en.wikipedia.org/wiki/AC_adapter

   An AC adapter or AC/DC adapter (also called a wall charger, power adapter, power brick, or wall wart) [1] is a type of external power supply, often enclosed in a case similar to an AC plug. [2] AC adapters deliver electric power to devices that lack internal components to draw voltage and power from mains power themselves.

3. Pointing stick - Wikipedia

   en.wikipedia.org/wiki/Pointing_stick

   Size: 8 x 8 mm. Out of patent IBM ThinkPad caps (left-to-right): Soft Dome, Soft Rim, Classic Dome, Eraser Head (discontinued) A pointing stick (or trackpoint , also referred to generically as a nub or nipple ) is a small analog stick used as a pointing device typically mounted centrally in a computer keyboard .