Definition & Meaning of "since the year dot"in English

What is the origin of the idiom "since the year dot" and when to use it?

The idiom "since the year dot" does not have a clear origin, but it is believed to have originated in British English. The phrase is used to emphasize the long duration of something, suggesting that it has been present or has existed since ancient times or from the very beginning. It is often used figuratively to describe customs, traditions, or knowledge that have been passed down through generations, highlighting their long-standing nature.