Definition & Meaning of "barnet (fair)"in English

What does "barnet fair" or "barnet" mean in Cockney rhyming slang?

The structure uses the rhyming pair "Barnet Fair" to stand for "hair," following the typical Cockney pattern of replacing a word with a phrase that rhymes with it, often then shortened to just "Barnet." It is used in Cockney rhyming slang (London, UK) to mean the hair on a person's head or their hairstyle. People typically say "I need to get my barnet cut" or "She's got lovely barnet." The term originated in early 20th century London East End rhyming slang culture, with Barnet Fair being a famous horse race in Barnet, Hertfordshire, and remains a classic, widely recognized example.