点点头
点点头 (diǎndiǎntóu) is a reduplicated form of 点头 (to nod) that conveys a lighter, gentler, or more casual nod. The reduplication of 点 softens the action, giving it a sense of brevity or casualness. This pattern of verb reduplication to soften an action is common in Chinese.
他听了我的话,轻轻点点头没说什么。
Tā tīng le wǒ de huà, qīngqīng diǎndiǎntóu méi shuō shénme.
He listened to what I said, nodded slightly, and didn't say anything.
奶奶点点头,表示同意我们出去玩。
Nǎinai diǎndiǎntóu, biǎoshì tóngyì wǒmen chūqù wán.
Grandma nodded, indicating she agreed to let us go out and play.
她对我点点头,然后就转身走了。
Tā duì wǒ diǎndiǎntóu, ránhòu jiù zhuǎnshēn zǒu le.
She nodded at me, then turned around and left.