一卡通

On the HSK 7-9 vocabulary list, at CEFR level C2.

tōng ㄧ ㄎㄚˇ ㄊㄨㄥ

    • the name of various contactless smart cards, notably Yikatong (mainly for public transport in Beijing) and iPASS (mainly for public transport in Taiwan)

Character by character

Sources