Changes the button labels for controller? Guessing.

*Edit - Yeah just tested it, it's the labels that appear on button mapping in the GUI. It's easiest to see in the map. On the right side you will see X O button mapping, if you switch to alternative glyphs you will see A B.

glyph
/ɡlif/

noun
1. a hieroglyphic character or symbol; a pictograph.
"flanges painted with esoteric glyphs"

2. ARCHITECTURE an ornamental carved groove or channel, as on a Greek frieze.