The height of the numbers and letters must not be less than 0.32 cm. For the lettering of drawings, the Latin or, where customary, the Greek alphabet must be used.[R. 11.13(h); ]
Source: http://www.epo.org/law-practice/legal-texts/html/guidelinespct/e/a_v_7_5_3.htm
Date retrieved: 17 May 2021