accumulator
noun
[ əˈkjuːmjʊleɪtə ]
• a person or thing that accumulates something.
• "he's a voracious accumulator of economic facts and data"
• a large rechargeable battery.
• a bet placed on a series of races (or other events), the winnings and stake from each being placed on the next.
• "an eight-horse accumulator"
• a register used to contain the results of an arithmetical or logical operation.