Talk:Yusuf Konevi/@comment-35141042-20180913143813/@comment-3452092-20180916211906

Per wikipedia:

"The ton" is a term commonly used to refer to Britain's high society during the late Regency and the reign of George IV, and later. It is a French word meaning "manners" or "style" and is pronounced as in French. The full phrase is le bon ton meaning "good manners" or "good form" – characteristics held as ideal by the British beau monde.

That matches with what I understood. Since it is technically not English, in every book I have ever seen it is written Ton or The Ton to show that the word is not English.