In many cases, sequences like are used in jewelry engraving or tattoos to commemorate a life-changing event. For instance:
Could represent a 25th birthday or the 25th day of a month. XIII (13): Often represents the year 2013. XIV (14): Often represents the year 2014. Quick Guide to Reading Roman Numerals
(If the "XXV XXV" is seen as a stylized repetition or a specific ceremonial notation).
To understand how we get there, let’s break down the individual components and the history behind this ancient counting system.