ONE-OFF is a happening that occurs only once and is not repeated, e.g. a one-off sale is a sales event that will occur only once.
DDA, among others, can mean: Disability Discrimination Act (1995, UK), Dividend Disbursing Agent (finance), Demand Deposit Account, Direct Deposit Advance (Wells Fargo), Direct Deposit Advice, Deposit Demand Account, or Design Development Activity.
POS is Point-Of-Sale.
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