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3.9 Audio Frequency Range 117 Table 3.4 Internationally Preferred ISO Numbers--Contd. 1 / 12 oct. 1 / 6 oct. 1 / 3 oct. 1 / 2 oct. 2 / 3 oct. 1 / 1 oct. Exact Value 6.683439130 7.079457794 7.498942039 40 ser. 6.70 7.10 7.50 8.00 8.50 9.00 9.50 20 ser. 7.10 8.00 9.00 10 ser. 6 1 / 3 ser. 5 ser. 3 1 / 3 ser 8.00 8.00 8.00 7.943282288 8.413951352 8.912509312 9.440608688 3.7 gReek AlPHABeT The Greek alphabet plays a major role in the language of engi-