Math Glossary Letter N n-gram noun a contiguous sequence of n items from a given sample of text or speech nanosecond noun a unit of time in the International System of Units equal to one billionth of a second napiers bones noun numbered rods which can be used to perform multiplication of any number by a number 2-9 narcissistic numbers noun a given number base b is a number that is the sum of its own digits each raised to the power of the number of digits. natural logarithm noun its logarithm to the base of the mathematical constant eeLn(x) = x natural number noun the positive integers (whole numbers) 1, 2, 3, ... nearest neighbor interpolation noun a simple method of multivariate interpolation in one or more dimensions negation noun reverses the truth value of a given statement.~ negative noun numbers or values less than 0 negative binomial distribution noun a special case of the discrete phase-type distribution net cost equivalent noun communicates how many pennies of cost the buyer must pay for every $1 of List Price net cost price noun the amount paid by the customer after all discounts and rebates are applied net income noun income minus cost of goods sold, expenses, depreciation and amortization, interest, and taxes for an accounting period net present value noun a method of balancing the current value of all future cash flows generated by a project against initial capital investmentCash flow at time t/( = i)2 net profit noun gross profit minus operating expenses and taxes net profit margin noun how much net income or profit is generated as a percentage of revenue(R - C)/R newton noun a temperature scale devised by Isaac Newton in 1701 newtons method noun another numerical method for solving an equation f... nickel noun A currency unit worth 5 cents nominal interest rate noun the interest rate before taking inflation into account. nominal yield noun the coupon rate on a bond nonagon noun 9 sided polygon or 9-gon norm noun a vector space whose elements (vectors) are matrices (of given dimensions). normal approximation to the binomial distribution noun when you use a continuous distribution (the normal distribution) to approximate a discrete distribution (the binomial distribution). normal distribution noun an arrangement of a data set in which most values cluster in the middle of the range and the rest taper off symmetrically toward either extreme. notation noun An expression made up of symbols for representing operations, unspecified numbers, relations and any other mathematical objects NPV noun Net Present Value. Discounting all cash flows based on payments and interest rate to time 0 nu noun A letter of the greek alphabet used for math notation.Ν ν null hypothesis noun in a statistical test, the hypothesis that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error.H0 number noun an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification. A quantity or amount. number bond noun a simple addition of two numbers that add up to give the sum number line noun a line on which numbers are marked at intervals, used to order numbers. Smaller numbers are on the left and larger numbers are on the right. number set noun a collection of numbers numerator noun the number above the line in a common fraction NYSIIS noun New York State Information and Intelligence Systems. A phonetic coding algorithm