It's a way to nod your head and say that you're okay with moving forward.

这个句型表示你会点头同意继续推进一件事情。

I'm ready to 课堂 - SpeakingMax英语口语达人

Every so often Craven would walk by, nod his head at me and I would nod my head back at him.

FORBES: Scary Movies, Scary Funds

Resemblances between his work and that of Rodin, Dali and others are, he says, coincidental although the black fedora apparently plastinated to his head is a nod towards the anatomist's hat in a famous portrait by Rembrandt.

ECONOMIST: Anatomy as art

To encourage a team member to expand on their comments, nod your head using clusters of three nods at regular intervals.

FORBES: Want to Build Collaboration? Watch Your Body Language!