In LaTeX, $(r)$ renders as Ⓡ

[WhiteNoise]

This is known bug which will be fixed in 0.6.6.

V(r) changes to V in inline latex mode

For reference I have attached an example. [V_r_obsidian] Environment Operating system: Windows 10 Obsidian version: 0.6.5 Using custom CSS: Red Graphite