What is the symbol of Latin word Congius?

In Apothecary Measures, the Latin Congius (abbreviation c.) is used for the Queen Anne gallon of 231 cubic inches, also known as the US gallon.

How many pints are in a Congius?

six pints ‘But just when I thought it was going to get good and circular it turns out that a congius is roughly equal to six pints, and so a sextarius is one pint. ‘ ‘In the nineteenth century, the congius was used in British medicine and pharmacology as a name for the British Imperial gallon. ‘

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