The best replacement for serial number is upc.

The best alternatives to serial number are rated as following:
★★★★★  upc
★★★★  vin number
★★★  model number
★★★  part number
★★★  service tag
★★  product key
★★  lot number
★  imei
★  mac address
★  udid
★  ime.i
  asset tag
  uuid
  license key
  crack for idm
  customer serial number

Your alternative for serial number is not listed? Suggest!
Speaking about serial number, one probably shouldn't forget about idm.

Other search terms related to serial number and their ratings are:
★★★★★ idm
★★ your ipod
You have in mind a companion for serial number and it is not yet here? Propose!



Google Trends

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serial number
upc
vin number