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Llythyr neu ddogfen swyddogol a gyhoeddir gan Bab yr Eglwys Gatholig yw bwl.[1] Daw'r enw o'r sêl blwm (Lladin: bulla) a osodir arno. Ers y 12g, defnyddir yr enw bwl ar ddogfen gan y Pab a chanddi selnod sy'n dangos pennau'r apostolion Pedr a Paul ar un ochr a llofnod y Pab ar yr ochr arall.[2]
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