Calculate – the etymology comes from the latin word for pebbles.

In Roman times, man-powered taxis would have a bingo-like device that rolls with the axis of the wheel, depositing a pebble for each rotation into a basket below. At the end of the ride, the driver/runner would calculate the pebbles that got dropped into the basket, thus figuring out the distance, and the cost, Book Spine Calculator of the ride.

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