<P> Some modern composers (including Francis Poulenc, Krzysztof Penderecki, and Luigi Nono) have expanded the symbol's usage to indicate approximate duration, incorporating fermatas of different sizes, square - and triangle - shaped fermatas, and so on to indicate holds of different lengths . However, that is not standard usage . In the music notation program, Sibelius, "By default, a regular fermata is set to 1.5 times written duration, a long (square) fermata is set to 1.75 times written duration, and a short (triangular) fermata is set to 1.25 written duration ." Thus a whole note with fermata would last 4 + 2 = 6 quarter notes, 4 + 3 = 7 quarter notes, or 4 + 1 = 5 quarter notes, respectively . </P> <P> The fermata sign is encoded in the Musical Symbols block of Unicode as U + 1D110 MUSICAL SYMBOL FERMATA: 𝄐 and U + 1D111 MUSICAL SYMBOL FERMATA BELOW: 𝄑 </P>

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