Money.
Money in general.
In the United Kingdom and Ireland, 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.
A unit of nail size, said to be either the cost per 100 nails, or the number of nails per penny. Abbreviation: d.
In various countries, a small-denomination copper or brass coin.
In the US and (formerly) Canada, a one-cent coin, worth ¹⁄₁₀₀ of a dollar. Abbreviation: ¢.
In Ireland, a coin worth ¹⁄₁₀₀ of an Irish pound before the introduction of the euro. Abbreviation: p.
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 such that they must finish it (or some such variation thereof); commonly associated with crewdates at Oxford and swaps at Cambridge.
To jam a door shut by inserting pennies between the doorframe and the door.