Also, maybe the M logo was already common before Medium came along... https://www.bloomberg.com/news/articles/2015-06-08/how-77-metro-agencies-design-the-letter

Also, maybe the M logo was already common before Medium came along... https://www.bloomberg.com/news/articles/2015-06-08/how-77-metro-agencies-design-the-letter-m-for-their-transit-logo https://www.bloomberg.com/news/articles/2015-06-08/how-77-me...