The kanji 徹 generally conveys the idea of "penetrating," "thorough," "complete," or "to go through". It suggests a sense of achieving something fully, without holding back. It also implies the idea of something going all the way, or pervading completely.

・On-yomi (音読み): テツ (tetsu) ・Kun-yomi (訓読み): とお（る）(tooru), とお（す）(toosu)

⚫︎ 徹底 (tettei) Translation: Thorough; Complete; Perfect; Overall ⚫︎ 徹夜 (tetsuya) Translation: Staying up all night; Staying up (until morning) ⚫︎ 貫徹 (kanketsu) Translation: Carrying through; accomplishment; to achieve; to go through

The kanji 徹 is a 形声文字 (keisei moji), a phono-semantic compound character. The left side is a radical called 彳 (gyou-nyou), the "step" radical, which represents movement or walking. The right side is 㣎 (tetsu), which provides the sound of the kanji and originally depicted the idea of piercing or going through. Together, the character signifies the action of "going through" or "penetrating" something. It evolved to represent the idea of thoroughness and completeness.