HP 48gII User's Manual
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Page B-13
when the ~… combination is used. The special characters generated by
the ~… combination include Greek letters (α, β, ∆, δ, ε, ρ, µ, λ, σ, θ, τ, ω,
and Π), other characters generated by the ~… combination are |, ‘, ^,
=, <, >, /, “, \, __, ~, !, ?, <<>>, and @.