Simple Pi Symbol Pins and Buttons

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Description: A large, metallic silver Pi symbol dominates the foreground against a black background. Scattered around and within the large symbol are numerous smaller, dark grey Pi symbols. The overall aesthetic is simple and symbolic.

Description: A bold white representation of the Greek letter Pi positioned above two white crossbones, forming a classic danger symbol. The entire composition is set against a stark black background.

Description: A circular emblem with a scalloped outer edge and a simple inner circle. Inside the circles, the Greek letter Pi (π) is rendered in a chalk-like style with visible hatching texture. The entire emblem is in white against a solid black background.