How do I request the addition of a Unicode symbol?
I am interested in the symbol “⟋” (U+27CB Mathematical Rising Diagonal) to use in variable names that represent ratios and derivatives. e.g.

dF⟋dx = 0.2
dF⟋dy = 0.5

I tried using the symbol ╱ (U+2571), but it is too big and gets confused with the division operator.

Indeed it could be confusing, however in monotype font (e.g. in VScode), it is rendered much smaller that the division operator. Also, syntax highlight helps to avoid confusion.