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Pi3 symbols
The Greek letter pi in all its forms. Open any one for its name and the fonts that have it.
About pi
Pi is one of the Greek letters that escaped the alphabet into general use: its capital and small forms do different jobs in mathematics and science, and each form is a separate character with its own codepoint.
The symbol forms, where Unicode provides them, are distinct from the letters — they exist so a formula keeps its meaning when fonts change. Copy from here and the character you paste is the exact one you tapped.