Absolutely. The German term equivalent to writing “Sincerely,” at the end of letters is “Mitt freundlichen grußen,” and it was (is?) often written as “M.f.G.” There’s even a song by the German pop/rock band Die Fantastischen Vier titled “M.f.G.” The lyrics are almost entirely various abbreviations (here’s a version of the song with the lyrics, but not the video).