allows repetitive lists to be specified concisely. A multiplier may be a number, or the substitution symbol (#) followed by a single-valued numerical data structure.
Post-multiplier
is given immediately after the second of a pair of round brackets enclosing a list of identifiers, numbers, or strings, and has the effect of repeating the entire list, as a whole, the specified number of times.
Pre-multiplier
occurs immediately before the initial (round) bracket of a pair enclosing a list of identifiers, numbers, or strings and has the effect of repeating each item, in turn, the specified number of times.