As might be expected, however, such name could not be used at official places like the Imperial Court or the bakufu (Japanese feudal government), so with the intention to avoid privately using the government post names, a custom was born to use abbreviations of official government posts.
しかし、さすがに朝廷や幕府など公式な場で用いるわけにはいかず、官途私称を憚る目的から、正式な官途名を工夫して、略して称する習慣が生まれた。