The spelling of the word "Trething" can be confusing. It is pronounced as /ˈtɹɛθɪŋ/ and is a variant of the word "tithing" which means a group of people responsible for maintaining law and order in a certain area. The spelling "trething" is thought to have originated from the old English word "tryðing" which meant a third part. Despite being a less commonly used spelling, it is still recognized as a valid form of the word "tithing".