(n) a factor in a given situation whose bearing and importance is not apparent, Example:I don't know what the new man will do; he's still an unknown quantity
[げん, gen] (n) (1) { math } unknown (e.g. in an equation); (2) { math } element (of a set); (3) yuan (monetary unit of China); (4) Yuan dynasty (China)#170
[さぐる, saguru] (v5r, vt) (1) to feel around for; to fumble for; to grope for; to search for; to look for; (2) to investigate; to probe into; to spy on; to sound out; (3) to explore (parts unknown); to enjoy (natural beauty); (P)#13178