What is pictorial representation of facial expression using punctuation marks called?

There isn't a specific, widely recognized term for using punctuation marks to represent facial expressions. However, you could describe it as:

* Punctuation-based facial expressions

* Punctuation emoticons (although "emoticon" typically refers to text-based representations)

* Punctuation-based character depictions

* Textual facial expressions

You can also use more descriptive terms depending on the context:

* A playful use of punctuation to convey emotion

* A creative way to represent facial expressions in writing

* A simple form of visual communication using punctuation

Ultimately, the best way to describe this depends on the specific context and how you want to emphasize the technique.