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#1 TOP DEFINITION
An official fan merchandise item — a branded glow stick unique to each K-pop group, used at concerts to create synchronized light shows. Each group has a signature lightstick design, color, and app-connected feature. Collecting lightsticks is a major part of K-pop fan culture.
Example
“ARMY Bombs (BTS's lightstick) can sync via Bluetooth to display patterns choreographed to the music during concerts.”