"Barbell curls" refers to a type of exercise where you use a straight barbell, typically weighted, to strengthen and build muscles in your biceps. Full definition
We recommend including four sets of barbell curls in your arm routine. (fitnessandpower.com)
You're going to need three sets of them and then follow up with 2 - 3 sets of regular standing barbell curls with a full range of motion! (fitnessandpower.com)
I just did a drop set yesterday with barbell curls. (sweatlikeapig.com)