Via @voitech@social.lol on Mastodon:

To display stars instead of numbers in \#Obsidian bases (e.g., movie ratings), click Properties → Add formula, name it, and enter:

“★★★★★”.slice(0, rating) + “☆☆☆☆☆”.slice(0, 5 - rating)

Replace “rating” with the key you saved in your notes’ properties. This works only for 1-5 scales.