How to label equation with a symbol?

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2

This is actually a normal asterisk, but we can replace it with a centered one.
I used asterisk operator in particular.
If you prefer a different one, you can select one at asterisk | Graphemica Search.

#set math.equation(
  numbering: n => {
    let symbols = ("∗", "†", "‡", "§", "¶", "‖")
    let symbol = symbols.at(calc.rem(n - 1, symbols.len()))
    [(#symbol)]
  },
  number-align: left,
)

$ f = u product g_i space.thin . $
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