This part of ISO 3098 specifies the Latin alphabet, numerals and marks for use on technical drawings and associated documents. It primarily concerns letters written with the aid of stencils, but is equally applicable to freehand lettering or other appropriate methods.
BS EN ISO 3098-2:2000 history
2000BS EN ISO 3098-2:2000 Technical product documentation - Lettering - Latin alphabet, numerals and marks