溝こうこうJLPTN1Meanings1numeric10^32; hundred nonillionrare termRare numeric unit for 10^32, used in traditional Japanese counting systems. Not used in everyday contexts.「溝こう」は、10の32乗じょうを表あらわす古ふるい数かずの単たん位いです。「溝」 is an old numeric unit representing 10^32.