Theta black filled icon
Filled Greek letter theta shown as a tall oval with a horizontal bar across the middle
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About the Theta black filled icon
A filled uppercase Greek letter theta: a tall, narrow oval with a single horizontal bar running through its center. The glyph stands for angle measure in trigonometry, phase in physics, temperature difference in engineering and theta decay in options trading. It suits math worksheets and formula sheets, physics and engineering lecture slides, scientific calculator and note-taking app keypads, fraternity and academic branding, and statistics dashboards that label a parameter.
The shape is built from an even-weight ring with a crossbar that stops just short of the outer edge, keeping the counters open at small sizes. Proportions are vertical rather than circular, so it lines up cleanly beside alpha, beta, pi, lambda and sigma from the same Greek alphabet set. Set it at 24 px or larger so the crossbar stays visible against dark backgrounds.
This is the solid black filled version of the theta icon: a bold silhouette that reads clearly at 16-24 px and on dark or busy backgrounds, and prints well in one colour.
Get it free as an SVG vector or transparent PNG (16-512px), copy the SVG code, or restyle it in the free online editor — recolor any part, add gold, neon or gradient effects, animate it, or export EPS, PDF and DXF.
Free for personal and commercial use with attribution.
