The letter was introduced during the Cyrillization of the North-Caucasian languages in the late 1930s. To keep new orthographies compatible with Russian typewriters, many of the new alphabets contained only letters found in the Russian alphabet. Sounds absent in Russian were marked with digraphs and other letter combinations. The palochka was the only exception, and in practice in typewriting, the Arabo-European digit 1 was used instead. In fact, on Russian typewriters this character did not look like digit 1 but looked like a Roman numeralI with serifs. That is still common because the palochka is not present in most standard keyboard layouts (and, for some of them, not even the soft-dotted I) or common fonts and so cannot be easily entered or reliably displayed on many computer systems.