Nummica

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A nummica is a headmate that handles the finances of a system. They will keep the system from over- or even underspending as well as making sure all bills are paid. They may even make plans for saving, they hold the system accountable for money spent and hold them to saving plans.

Related Terms
This could be considered a form of caretaking and may be related to other roles like innkeeper or manager. For some the host will also be a nummica.

History
From the Latin word nummus meaning 'coin' and the Latin word amica meaning 'friend', making 'money or coin friend'