Japanese Symbol For Beginner, also known as "Shoshinsha Mark" or by badboyhalo's stream text to speech "Green and Yellow Leaf", it's a green and yellow shield. It must be displayed by new drivers in Japan, after they receive their driver license.

It's also an meme by Skeppy.

A cultural and aesthetic mind-state that prioritizes making money, even as an “underground” or “radical” creator. The work isn’t made for money, but it’s the money that matters the most.