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Definition: Ffens o fyrddau pren etc a godir o amgylch adeilad yn ystod ei adeiladu neu ei atgyweirio ac a ddefnyddir i arddangos hysbysebion, neu strwythur tebyg arall a godir i arddangos hysbysebion.
Notes: Yng nghyd-destun y gyfundrefn gyfreithiol ar gyfer rheolaethu hysbysebion.
