Strike the center of the syahi with the index fingertip and release instantly, letting the whole head ring — the drum's full tuned note, its most bell-like sound. No damping fingers rest on the skin; everything lifts.
Tun anchors phrases like Ektaal's "Tu Na" and closes many tukras with a sustained ring. Because it exposes the drum's tuning nakedly, a wavering Tun usually indicts the tuning, not the finger. In bol text it also appears as Tu.