summit, peak
巘 centers on a high, pointed mountain top: a summit or peak.
巘 combines 山 (mountain) with 獻, which likely contributes the sound. The exact historical development of 獻 is uncertain.
The mountain radical 山 on the left stands beside the complex 獻. Picture a towering, jagged peak that looks as intricate as the strokes of 獻.
For ゴン, imagine a gong echoing from the summit: gong -> ゴン, and the sound reverberates across the mountain peak.