The big wheel on a Victorian high-wheel bicycle is named for what coin?
The penny-farthing looks pretty dangerous to most people today (and it is!), but back in the 1870s, supersizing a bicycle's front wheel was the best way to make the machine go faster. In that day, British currency included pennies, which were larger coins, and farthings, which were very small, so the bicycles gained the nickname "penny-farthings," which is still how they're fondly known today.
Source: BBC