Oxygen O2 Bubbles black filled icon
Chemical formula O2 with two round bubbles rising above the letter
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About the Oxygen O2 Bubbles black filled icon
A large capital O with a subscript 2 spells the chemical formula for oxygen, and two round bubbles of different sizes rise above it. The mark communicates breathable air, oxygen therapy and dissolved oxygen, which suits medical device interfaces, hospital signage, air purifier packaging, water treatment diagrams, chemistry lessons and scuba diving apps.
Letterforms are geometric, with the O drawn as an even heavy ring and the 2 kept small enough to read as a subscript rather than a separate character. It pairs with carbon dioxide, lungs and nitrogen icons. Keep it above 32 px so the subscript stays legible.
This is the solid black filled version of the oxygen o2 bubbles icon: a bold silhouette that reads clearly at 16-24 px and on dark or busy backgrounds, and prints well in one colour.
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.
