Fuel refers to any material (but mostly liquid) that can be burned to make energy.

See also:
"Fuel" is in the NAICS Code "221112"
  (Fossil Fuel Electric Power GenerationElectric power generation , fossil fuel (e.g., coal , oil, gas))


"Fuel" is in the CPC Code "03130"
  Fuel wood, in logs, in billets, in twigs , in faggots or in similar forms

"Fuel" is in the HS Code "4401.10"
  - - Fuel wood, in logs, in billets, in twigs, in faggots or in similar forms