Noun giro has 2 senses

• giro(n = noun.possession) giro cheque - a check given by the British government to someone who is unemployed; it can be cashed either at a bank or at the post office; Array
is a kind of bank check, check, cheque

• giro(n = noun.group) Array - a British financial system in which a bank or a post office transfers money from one account to another when they receive authorization to do so; Array
is a kind of financial institution, financial organisation, financial organization