ditto marks

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Concise Oxford English Dictionary © 2008 Oxford University Press:
ditto/ˈdɪtəʊ/

▶noun

• 1 the same thing again (used in lists and often indicated by a ditto mark).

• 2 (also ditto mark) a symbol consisting of two apostrophes (〃) placed under an item to be repeated.

– origin C17: from Tuscan dial., var. of Ital. detto ‘said’, from L. dictus ‘said’.