DELTA, in securities trading, is the relationship between an option price and the underlying futures contract or stock price. In general usage, it is the difference between two empirical data points, e.g. the delta between 4 and 6 is 2.

SETTLEMENT DISCOUNT is the discount percentage offered for payment within the settlement period. Many vendors offer settlement discounts for early payment of invoiced amounts.

PROBABILITY PROPORTIONAL TO SIZE SAMPLING (PPS) is a sampling plan that bases the likelihood of selecting a particular account on the relative size of that account, so larger accounts have a greater probability of being selected for the sample than smaller accounts. Also known as dollar unit.

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