Right hand palm - Ukajo

…It is also called kansho. In the Ritsuryo official system, the Dajokan had a sho for each of the left and right benkan and the eight ministries, and the sho for the left and right benkan were called sakajoyo (left official) and ukajoyo (right official), and the sho for the eight ministries was called shosho (minister official). Each had a maximum of two people. …

*Some of the terminology explanations that refer to "Ukansho" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…〈かんしょう〉ともいう。律令官制においては，太政官内の左右弁官および八省に掌が置かれ，左弁官･右弁官の掌を左官掌（さかじよう）･右官掌（うかじよう），八省の掌を省掌（しようしよう）といった。それぞれ定員は2名。…

※「右官掌」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報