The kanji 徹 generally conveys the meaning of "penetrate," "thorough," "complete," or "go through." It implies something that extends fully, without limits, or that something has been done completely. It can also refer to a process or an idea that continues to the end.

・On-yomi (音読み): テツ (tetsu) ・Kun-yomi (訓読み): とお（る） (tōru) - to go through, to pass through; とお（す） (tōsu) - to let pass through, to carry out thoroughly

⚫︎ 徹底（てってい） Translation: Thorough; complete; consistent. ⚫︎ 徹夜（てつや） Translation: Staying up all night; a whole night. ⚫︎ 貫徹（かんてつ） Translation: Carrying out; accomplishment; to go through.

The kanji 徹 is a phono-semantic compound (形声文字; けいせいもじ). It combines two components: ⚫︎ The phonetic component: 撤（テツ, tetsu), which provides a sound clue. ⚫︎ The radical: 彳 (ぎょうにんべん, gyōninben), a variation of 行(going), which indicates "movement," "walk," or "action". The original meaning suggests the idea of "going all the way through" or "penetrating" to the end, thus conveying the sense of thoroughness or completion. The radical 彳 is used to suggest moving or walking through something.