the prevailing standard is wikipedia mos article titles which points us at wikipedia naming conventions use english there doesn't seem to be a specific naming convention that applies which says the most commonly used english version of the name of the subject as the title of the article as you would find it in verifiable reliable sources so we should in general do what other reference works do britannica says reichssicherheitshauptamt fas says reich's main security office encarta doesn't seem to have an article at all even its article on heydrich is dismal a bunch of the holocaust research info sites including wiesenthal stick with rsha link so it's not immediately clear to me which of these three options rsha reichssicherheitshauptam reich's main security office enjoys the most common use talk