The Letter O icon is part of the Lucide open-source icon set — a curated, consistent library used by indie devs and design teams. Lucide draws every icon on a 24×24 grid with a 2px stroke, so this Letter O icon will sit visually next to any other Lucide icon without retouching.
Search keywords related to this icon: alphabet, character, text, font, typography, uppercase, oxygen, chemistry, blood type, off, zero, marker. If you're looking for a similar mark, the related grid below shares tags with this one.
Need it in a screenshot, mockup, or App Store preview? The Drop into editor button above opens the LaunchShots screenshot maker with the icon pre-loaded as a sticker — resize from any corner, change the color from the float toolbar, and export as PNG.