This is the system of standardized marks in written language to clarify meaning?

That's a great description of punctuation. Punctuation is the system of standardized marks used in written language to clarify meaning, structure, and intonation.

Here are some examples of how punctuation can help:

* Periods (.) mark the end of a sentence and indicate a pause.

* Commas (,) separate items in a list, indicate a pause in a sentence, and can be used to set off parentheticals.

* Question marks (?) are used at the end of a question.

* Exclamation points (!) are used to express strong emotion or emphasis.

Punctuation is crucial for effective communication in writing, ensuring that readers can understand the intended meaning and flow of ideas.