What is a dub in money?

A "dub" is slang term for a $20 bill. It originated from the use of the word "double" to refer to the number 20, thus creating the nickname "dub". The term is commonly used in urban areas or within hip-hop culture. The origin of the nickname is not entirely clear, but it is believed to have developed in the late 1990s or early 2000s. In recent years, the popularity of digital payments and transactions has led to a decrease in the use of cash, and therefore the use of terms like "dub" has become less common.