It's a stationary pointing device, commonly used on laptop computers.
Improvised explosive device | Charge-coupled device | Personal flotation device | improvised explosive device | medical device | GPS navigation device | Telecommunications device for the deaf | Spring (device) | mobile device | Incendiary device | Data storage device | Seal (device) | Night vision device | Display device | device driver | charge-coupled device | Ventricular assist device | Residual-current device | Null Device | Mobile device | Long Range Acoustic Device | Improvised Explosive Device | Graphics Device Interface | Device Forts | Device | Stargate (device) | Semiconductor device | Pedersen device | Intrauterine device | Digital Message Device |