Oxygen O2 black outline icon
O2 oxygen chemical formula icon with a round filled dot above the letter
About the Oxygen O2 black outline icon
A bold letter O sits beside a subscript 2, spelling the chemical formula for oxygen, with a solid filled dot floating above like a single atom. It stands for breathable air, oxygen therapy and gas concentration. Useful on hospital and clinic screens, oxygen concentrator labels, chemistry and biology lesson slides, air quality dashboards, and diving or aviation equipment guides.
The counter of the O is wide and geometric, the numeral 2 is drawn with the same stroke thickness, and the detached dot adds asymmetry that keeps the lockup from looking like plain text. Pair it with CO2, nitrogen and air filter icons, and avoid sizes under 20 px where the subscript closes up.
This is the black outline version of the oxygen o2 icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
It downloads free as an SVG vector or transparent PNG in seven sizes, and the free online editor lets you recolor it, apply gold, silver, neon and gradient styles, add animation, or convert it to EPS, PDF and DXF.
Free for personal and commercial use with attribution.
