Kalmar "ASCII hali" tana nufin harafi ɗaya ko alama daga saitin haruffan ASCII (Amurka don Musanya Bayanai). ASCII daidaitaccen yanayin ɓoye ne da ake amfani da shi a cikin kwamfutoci da tsarin sadarwa don wakiltar rubutu ta hanyar dijital.Kowace haruffa ASCII ana wakilta ta da lambar binary 7-bit na musamman (ko wani lokacin 8 bits) wanda ke ba da damar kwamfutoci don wakilci. da kuma sadar da bayanan rubutu. Saitin haruffan ASCII ya ƙunshi haruffa 128, waɗanda suka haɗa da haruffa, lambobi, alamomin rubutu, da sauran alamomi.Misali, lambar ASCII na harafin "A" shine 65, kuma lambar ASCII don lambar. "7" shine 55. Ana amfani da saitin halayen ASCII sosai a cikin tsarin kwamfuta, harsunan shirye-shirye, da ka'idojin sadarwa.