铃

Left metal radical - simplified side-form of 金, indexing radical for 铃. Bells were cast bronze and later iron, so the metal classification is literal. Same metal-radical family as 钟 (large bell / clock), 钢 (steel), 银 (silver), 铜 (copper). The radical sets 铃 apart from sound-making chars built on different materials.

Right phonetic 令 - supplies the sound (lìng → líng, slight initial palatalization; the líng-family includes 龄 líng age, 玲 líng tinkling, 灵 líng spirit, 零 líng zero). Itself depicting a kneeling person under a command/decree. Faint semantic echo: bells were rung to issue orders or signal events, fitting the 'command-tone' phonetic.