What does Do. mean in Days Abbreviations?

do.

The ditto mark is a shorthand sign, used mostly in hand-written text, indicating that the words or figures above it are to be repeated.The mark is made using 'a pair of apostrophes'; 'a pair of marks " used underneath a word'; the symbol " (quotation mark); or the symbol ” (right double quotation mark).In the following example, the second line reads "Blue pens, box of twenty". Black pens, box of twenty ... $2.10 Blue " " " " ... $2.35

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