I noticed the Buttons section of the Designing for Playdate documentation says the following:
When instructing the player about your game’s UI, it’s helpful to enclose the A and B in circles... We provide glyphs for this in many of our fonts, mapped to the following characters:
Ⓐ Ⓑ
By the way, we have also font characters for other Playdate buttons:
⊙
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✛
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These are not supported in Pulp fonts at the moment.