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! Type in unicode polytonic Greek using beta code as indicated below:
/a => ά \a => ὰ =a => ᾶ )a => ἀ
(a => ἁ !a => ᾳ +i => ϊ h => η
q => θ x => χ c => ξ z = ζ
j => ψ w => ω s => σ, ς  
Combine punctuation marks when necessary e.g. )/a => ἄ
Τ, τ (ταῦ) (τό)

1   indecl. tau, 19ª letra do alfabeto

num. 2   τʹ =300 ou 300º 3   ͵τ = 300.000 ou 300.000º.