In a right angled triangle, one of the angles is denoted theta. What is the symbol for the other angle? I have a vague feeling it's lower case sigma or phi but I can't find anything to comfirm or deny that.
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There is no standard delineation for the angles of a triangle as long as it is clear and not liable to be confused with others within the particular case; though some of the Greek letters are conventional for certain applications.
Common ones are -
Δ and δ - the Differentiation operators,
π That wonderfully poetically-described "irrational and transcendental number" Pi, crops up all over the place, not just in simple circle and sphere sums!
Σ is capital-Sigma, the series / summation operator, with superscript / subscript limit notes,
λ and σ are Lambda and Rho, conventionally used for wavelength and density respectively, in fields such as Acoustics,
α, β and [i]γ[/i] are used to denote the alpha, beta and gamma forms of radioactivity. Gamma might just show here as an italic 'y',
Ω - Omega, for Ohms, of electrical resistance,
ω - lower-case omega, used in calculations of rotation.