The Extended IPA has adopted bracket notation from conventions transcribing discourse. Parentheses are used to indicate "mouthing" (silent articulation), as in , a silent sign to hush. Parentheses are also used to indicate silent pauses, for example (...). Double parentheses indicate extraneous noise, as in ⸨2 syll.⸩ or ⸨2σ⸩ for two extraneous syllables, though the IPA convention is that double parentheses indicate that a sound is obscured, as when one person talks over another, and this is identified as the extIPA usage.