警钟
jǐng zhōng · HSK 7
alarm bell
🔔 警 = warn/alert + 钟 = bell, so 警钟 = the bell that warns you of danger
警 (jǐng) means warn or alert, the same 警 as in 警察 police. 钟 (zhōng) is a bell. Together: a warning bell, literal or figurative, that sounds an alarm.
钟 — metal radical 钅 + child 童 (phonetic)
Originally a pictograph of a hanging bell, 钟 is now a semantic-phonetic compound: 钅 (metal) gives the meaning, while 童 hints at the sound. It is the simplified form merging two traditional characters, 鐘 (bell, clock) and 鍾 (cup, to concentrate).