Halfpennies are also known as 'ha'pennies' or 'half pennies', and are a denomination of currency that have been used in various countries over the years. In the UK, halfpennies were in circulation until they were phased out in the 1980s. Other countries which have used halfpennies include Australia, Ireland, and Jamaica. Synonyms for halfpennies include 'two farthings', 'halfpence', 'halfpenny piece', 'tuppence halfpenny', and 'haypenny'. While the use of halfpennies has largely disappeared in modern times, the term is still used in phrases such as 'not worth a halfpenny' to denote something of little value or importance.