The Dozenal Society of Great Britain (DSGB) proposed symbols and . This notation, derived from Arabic digits by 180° rotation, was introduced by Isaac Pitman. In March 2013, a proposal was submitted to include the digit forms for ten and eleven propagated by the Dozenal Societies in the Unicode Standard. Of these, the British/Pitman forms were accepted for encoding as characters at code points and . They were included in the Unicode 8.0 release in June 2015 and are available in LaTeX as codice_1 and codice_2.