'Widow's Son' is a term used in Freemasonry to refer to Hiram Abiff, the protagonist of the Master Mason degree. According to Masonic tradition, Hiram was the son of a widow (a widow from the tribe of Naphtali) and a skilled artisan from the tribe of Tyre. The term 'Widow's Son' is used to emphasize his humble origins and the importance of perseverance and the pursuit of knowledge and virtue in Freemasonry.