noun
Historical term for submitting a report or petition to the emperor. In modern contexts, it may appear in historical dramas or formal documents.
See also: 奏する (そうする)
家臣が帝に奏を奉った。
The vassal presented a report to the emperor.
奏する is the verb form meaning 'to report to the emperor', while 奏 is the noun form referring to the report itself.
The kanji 奏 originally means 'to offer' or 'to present', and in this context it specifically refers to presenting a report to the emperor. The reading そう is the on'yomi.