AABB-style reduplication of
叮当 (dīngdāng) — the same sound that gives Doraemon his Chinese name
叮当 /
哆啦A梦. The expanded
叮叮当当 form draws out the rhythm: think wind chimes, sleigh bells, or the rolling clang of hammer on anvil. Both characters carry the
口 (mouth) radical, marking them as pure sound effects.