When Marriott Bonv∘y was introduced in mid 2018 to replace Marriott Rewards and coinciding with the acquisition of Starwood, I also used the degree symbol (°) for almost a year , until discovering the slightly larger and lower symbol (∘). For ready comparison: (° ∘).

The zero exponent (º), normally used to modify the antecedent number to the 0 power, which equals 1, is also too far above the top of the other letters, and is not the correct purely circular shape. (° ∘ º)

That is why I put the letters in boldface, to match the proportions as closely as possible to the Bonvoy logo.

In one area, the attempt to replicate the logo with FlyerTalk characters falls "short" -- the underline.

In the logo, the underline below the "o" is elevated, whereas using the [ u] function is the same for all characters, at the very bottom. I wonder if the strikethrough would work better?

Bonv∘yed again? Yes, it appears, though the latter would work with the degree symbol.

Beaucoup Bonv°y!