The |mult{xx} filter is a mathematical operation filter.
It returns the results of multiplying (the product) the value of the tag and the xx argument passed to the filter.
If the tag’s output is not a numeric type, it will be considered as being 0 (zero) and the filter will simply return 0 (zero): [(#TEXTE|mult{18})] will return "0".
It is possible to assign a negative number as the argument to the filter: [(#TOTAL_BOUCLE|mult{-5.2})].
Warning: if xx is a floating point number, it must be written with a period as per the English method as opposed to being written with a comma as some European languages do: [(#TOTAL_BOUCLE|mult{5.2})].