The forum doesn’t have an official logo, much like Bitcoin itself. While BTC represents Bitcoin, it is not an official logo. This is due to the forum’s decentralized and community-driven nature—it doesn’t function as a brand or entity. With no central authority behind it, there has never been a push for an official logo..
Bitcoin has just one logo which some people can argue that it is the official logo. It was discussed on this forum and created by someone on this forum. It is the logo that everyone accepted as bitcoin logo and it is the only logo of bitcoin.
https://en.m.wikipedia.org/wiki/Bitcoin