Note: I found this sign on a Belgian website, so it may not be indigenous, but most of the signs in this site are quite accurate, so given that, it's reasonable to use it until proven otherwise. [B^ dot] is held under nose with fingers above the lips and the thumb beneath. The hand is drawn > DS while closing to [O^]. For a QuickTime movie of this sign, see Woordenboek Nederlands - Vlaamse Gebarentaal: Sofia.