penny

In the United Kingdom and Ireland and many other countries, a unit of currency worth ¹⁄₂₄₀ of a pound sterling or Irish pound before decimalisation, or a copper coin worth this amount. Abbreviation: d.

In the United Kingdom, a unit of currency worth ¹⁄₁₀₀ of a pound sterling, or a copper coin worth this amount. Abbreviation: p.

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In Ireland, a coin worth ¹⁄₁₀₀ of an Irish pound before the introduction of the euro. Abbreviation: p.

In the US and (formerly) Canada, a one-cent coin, worth ¹⁄₁₀₀ of a dollar. Abbreviation: ¢.

In various countries, a small-denomination copper or brass coin.

A unit of nail size, said to be either the cost per 100 nails, or the number of nails per penny. Abbreviation: d.

Money in general.

To jam a door shut by inserting pennies between the doorframe and the door.

To circumvent the tripping of an electrical circuit breaker by the dangerous practice of inserting a coin in place of a fuse in a fuse socket.

During a meal or as part of a drinking game, to drop a penny in a person's drink with the expectation that they finish it (or some such variation thereof); commonly associated with crewdates at Oxford and swaps at Cambridge.