Third, if we need to indicate “circling” (that is, physical enclosure in a circle) of a symbols-sequence that consists of more than one item, then yes, using braille grouping indicators is a good solution.
The example you shared is a simple up pointing arrow and a dollar sign circled together:
;;$=[<\+@s>
That symbols-sequence is a grade 1 word indicator, the two-cell symbol for a circle (shape indicator and a full cell), the physical enclosure cell, opening braille grouping indicator, the two-cell symbol for a simple up pointing arrow, the two-cell dollar symbol, closing braille grouping indicator, and then space.