Phi Symbol (φ)

Phi Symbol covers lowercase Greek phi, φ, encoded as U+03C6. It is used as a Greek letter and as a variable in technical work. The surrounding equation assigns the meaning. The reviewed examples include an angle φ = 30° and a phase variable φ(t). Other disciplines may assign phi to flux, potential, or a ratio, but those meanings cannot be inferred from the letter alone. The page therefore remains a character lookup rather than a list of every possible phi formula. Unicode also contains another lowercase phi form, ϕ. Fonts and mathematical style conventions may prefer one glyph shape or the other. Uppercase Phi Φ is a different character. Styled mathematical alphabets can also encode separate symbols. Copying from a PDF or equation editor should be checked when exact text matters. The Unicode Greek chart and existing accessibility references support the identity and labeling guidance. No golden-ratio, engineering, or physics claim is added unless the page’s source set directly supports it. For Phi Symbol, those samples represent greek text, variables, scientific notation, and symbol references; each one supplies the surrounding context that the symbol alone cannot provide. Define the field-specific use of φ. Keep lowercase φ and uppercase Φ distinct.