Commodities Crude Facts: Why short form for oil barrel is bbl, not bl Updated : April 22, 2020 01:19 PM IST When expressed in short form, oil carrying barrel is referred to as ‘bbl’ and not ‘bl’ though barrel has only one ‘b’ in it. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.