The kanji 通 primarily conveys the idea of "passing through," "going through," "communication," or "being connected." It implies a movement, a connection, or a process that allows something to move from one point to another or to be understood.

・On-yomi (音読み): ツウ (tsuu), ツ (tsu) ・Kun-yomi (訓読み): とお (too - to pass through), とお.る (too.ru - to go through/pass through), かよ.う (kayo.u - to commute/attend)

⚫︎ 交通（こうつう） Translation: Transportation/Traffic ⚫︎ 通行（つうこう） Translation: Passage/Passing ⚫︎ 普通（ふつう） Translation: Normal/Ordinary

The kanji 通 is a phono-semantic compound (形声文字 - keisei moji). The radical is 辶（しんにょう - shinnyou), which signifies "movement" or "to go." The phonetic component is 甬（よう - you), which originally depicted a well and later represented the sound "you". Therefore, 通 originally suggested a path leading to a well, indicating a passage or way. The character then evolved to represent the broader concept of "passing through," "communicating," and "connecting".