The article discusses the significance of the character 'j' at the end of a Roman numeral, but the text is unavailable. However, based on the comments, it appears that the 'j' was used to indicate the end of a number and prevent forgery. The practice of using Roman numerals with a line above the letters and a 'j' at the end was customary in the past, particularly in prescriptions. This method was intended to make it more difficult to alter the numbers.