Indicate external links with an icon

[eh-am]

It's nice to be able to tell visually whether a link leads to an external website or not.
For illustration, which one of these are external links?

We could add an icon on the right side to indicate it's an external link. For example:
https://blog.codecentric.de

From bunpro

https://electrictoolbox.com/add-offsite-link-icon-after-external-links-css/