What is the worlds longest punctuation mark?

That's a fun question! There isn't really a single "longest" punctuation mark in the world. Here's why:

* Punctuation marks have standard sizes: Most punctuation marks have standard sizes that are defined by fonts. While some fonts might have slightly larger or smaller versions, they generally follow a consistent set of dimensions.

* Length is relative: The length of a punctuation mark is relative to the size of the font it's used with. An em dash (—) might appear longer than a hyphen (-) in a large font, but it's still considered the same punctuation mark.

* Unusual punctuation: Some languages or writing systems might have unusual punctuation marks that are longer than standard ones, but these aren't widely recognized or used in the same way as common punctuation.

So, the answer to your question depends on what you consider a "punctuation mark" and how you're measuring "length."

Let me know if you want to explore the lengths of specific punctuation marks or have other fun language questions!