Symbol 4:10
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04:10 ·
The variation
and similar forms are found in musical notation
and signify a decrease in volume or diminuendo.
When placed the other way, 
,
it denotes the opposite crescendo. In this use the signs are iconic, pictures
so to speak, of sound structures.
Compare with 
in Group 34
and 
in Group 36, which have
similar functions.