The entire top of the mouse is a button, allowing you to click by simply applying pressure with your palm -- a boon for people who have concerns about the ergonomic correctness of using a single finger to click.

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He held up a single finger.

NPR: Excerpt: 'Skybreaker'

For example, rotating with two fingers turns the volume up or down, and a single-finger swipe changes channels.

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Particularly compared to the touchpad, which falters at single-finger navigation, the pointing stick is impeccably precise when it comes to moving the cursor around screen.

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But a single tap of a finger is a lot easier than thumbing a Web address into a tiny browser.

CNN: Doug Gross,

Kuroda was checked by the Yankees after Victorino's single smacked the middle finger of his right hand starting the second, then hit rookie Jackie Bradley Jr. with a pitch in the lower leg.

WSJ: Another injury, loss as Yanks fall 7-4 to Red Sox

Harbhajan was due to spend the summer with Lancashire in 2003, but they eventually terminated his contract without him making a single appearance because of the finger injury.

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Currently, depending on what they were designed for, some packages can take account of finger movements, while others treat a hand as a single lump.

ECONOMIST: Manufacturing technology