Nts stands for Stampa:BuumberStampa:BuableStampa:Buorting and is used to display numbers with thousands separator in a sortable table and have them numerically sorted in alphabetic sort mode. It is applied to all numbers of a column, in cases where numeric sort mode does not work or is not desired.
If some table cells in a column contain text after the number, or if the numbers are preceded by some fixed text other than a currency symbol, alphabetic sorting mode is needed.
Also, formerly, for table sorting to function correctly, numbers had to be entered with not more than one thousands separator. As a workaround alphabetic sorting mode was applied, and the numbers provided with a hidden part so that alphabetic sorting corresponded with numeric sorting. Since a mix in one column of numbers formatted for alphabetic sorting and plain numbers does not allow proper sorting, adding a number in an existing table may require putting it in the format used in that column.
This template automatically creates hidden code like <span style="display:none">&0000000123456789.001230</span> before the actual displayed number. The preceding ampersand forces the sorting routine to use text sort. The routine sorts the total text without the tags, which corresponds to numeric sorting due to the leading zeros.