Table 1. Codes for special symbols for use in text string annotations.

Code	Symbol	Code	Symbol
[alpha]	α	[sigma1]	ς
[beta]	β	[upsilon]	υ
[chi]	χ	[tau]	τ
[delta]	δ	[xi]	ξ
[Delta]	Δ	[psi]	ψ
[epsilon]	ε	[Psi]	Ψ
[phi]	φ	[zeta]	ζ
[gamma]	γ	[intersection]	⋂
[Gamma]	Γ	[union]	⋃
[eta]	η	[angle]	∠
[iota]	ι	[equivalence]	≡
[lambda]	λ	[plusminus]	±
[kappa]	κ	[lesserequal]	≤
[mu]	μ	[greaterequal]	≥
[nu]	ν	[diamond]	⧫
[pi]	π	[heart]	♥
[Pi]	Π	[spade]	♠
[rho]	ρ	[club]	♣
[theta]	θ
[Theta]	Θ
[theta1]	ϑ
[omega]	ω
[Omega]	Ω
[sigma]	σ
[Sigma]	Σ