函 hán 🔊 envelope 8 strokes + Review this word Meanings hán envelopecaselettervariant of 函[han2] Words with 函 函数 hán shù function (math.) 信函 xìn hán letter 函授 hán shòu to teach by correspondence 致函 zhì hán to send a letter 三角函数 sān jiǎo hán shù trigonometric function 书函 shū hán letter 函谷关 Hán gǔ Guān Hangu Pass in modern day Henan Province… 函件 hán jiàn letters 连续函数 lián xù hán shù continuous function 来函 lái hán incoming letter 公函 gōng hán official letter 邀请函 yāo qǐng hán invitation letter