This is a Japanese symbol, which surrounds a Japanese character with an outer frame, which looks a bit like the Chinese word "get". This character means "bargaining", and sometimes it can mean giving up something acquired in exchange for something.
In the emoji of most platforms, the frame of the logo is round, only the frame depicted by WhatsApp platform is hexagonal, and the frame depicted by OpenMoji platform is square. As for the color of characters, most platforms use white, and some platforms use black or red. As for the background color of the frame, it also varies from platform to platform, including red, orange, white and gray.
