Section 11 in The Official Languages (Use For Official Purposes Of The Union) Rules, 1976
11. Manuals, codes, other procedural literature, articles of stationery, etc .-(1) All manuals, codes and other procedural literature relating to Central Government offices shall be printed or cyclostyled, as the case may be, and published both in Hindi and English in diglot form.
(2)The forms and headings of registers used in any Central Government office shall be in Hindi and in English.(3)All name-plates, sign boards, letter-heads and inscriptions on envelopes and other items of stationery written, printed or inscribed for use in any Central Government office shall be in Hindi and in English:Provided that the Central Government may, that is considered necessary to do so by general or special order exempt any Central Government Office from all or any of the provisions of this rule.
