Why quid instead of pound?

"Quid" is a colloquial term for the British pound sterling, often used informally in conversation. It's believed to have originated from the Latin phrase "quid pro quo," meaning "something for something." Using "quid" can convey a more casual tone, and it's widely understood in the UK. Ultimately, the choice between "quid" and "pound" often depends on the context and setting of the conversation.