シリアル番号 でしょう
shiriarubangōdeshō
1. Probably the serial number.
Noun
#209087
1. Probably the serial number.
1. telephone number
1. number on the back of a player's uniform; uniform number
1. serial
1. cereal; breakfast cereal
1. number; series of digits
1. registration number
1. account number (bank, etc.)
1. it seems; I think
2. right?; don't you agree?