A chronogram is a unique form of writing where particular letters have assigned numerical values that add up to a specific year or date. There are various synonyms for the word, including chronograph, horologe and timepiece. A chronometer is a type of watch specifically designed to keep precise time. Additionally, an anachronism is something that is out of its proper time period, while synchronicity refers to events that happen concurrently. More synonyms for chronogram include date finder, calendar converter, and chronologic chart. In summary, a chronogram is a useful tool for historical research and dating events, and there are many related terms that can be used to describe it.