Enumerators, or the clerks that tallied the data, sometimes added marks or numbers to columns. In the 1852 Census for example, one will often find Xs or other marks in the 'residence' column that indicate various things including marital status. This data does not relate to the purpose of the column, which is to record the residence if out of district limits, and should not be recorded in the residence column.
Remember that the original image is only a click away so any extra information on the form is readily available there. The rule is to only transcribe data under a column if that data relates to that column. More.
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