preferred numbers, series of preferred numbers, preferred values
arvude rida, mis on üles ehitatud geomeetrilise progressioonina, kus iga järgnev rea arv on saadud eelmise arvu ja mingi kindla reateguri korrutisena, kusjuures reategurid on arvu kümme juured, conventionally rounded of term values of geometrical series, including the integral powers of 10 and having as ratios special factors in accordance with the specified tables, standard guidelines for choosing exact dimensions within a given set of constraints
