double whole note

US /ˌdʌb.əl ˈhoʊl ˌnoʊt/
UK /ˌdʌb.əl ˈhoʊl ˌnoʊt/
"double whole note" picture
1.

breve, dupla semibreve

a musical note having the longest time value in common use, equal to two whole notes or eight quarter notes

:
The composer used a double whole note to indicate a sustained sound.
O compositor usou uma breve para indicar um som sustentado.
A double whole note is rarely seen in modern music notation.
Uma breve raramente é vista na notação musical moderna.