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I suppose this is "debits and credits (abbreviated Dr and Cr, respectively) are entries made in account ledgers to record changes in value resulting from business transactions. Generally speaking, the source account for the transaction is credited (that is, an entry is made on the right side of the account's ledger) and the destination account is debited (that is, an entry is made on the left side). Total debits must equal total credits for each transaction; individual transactions may require multiple debit and credit entries to record." (C) Wikipedia.org
