concentration lines; saturated linework
In manga and illustration, lines radiating outward from a focal point to emphasize action, emotion, or impact. Often used in action scenes or dramatic moments.
In manga, concentration lines are often used in explosion scenes.
The concentration lines in this panel emphasize the character's surprise.
Compound of 集中 (concentration) and 線 (line), literally 'concentration lines'. The term is used in the context of manga and illustration.