The external link indicator

I recently learned a trick to make an indicator for external link from Mu-An's website, it perfectly matches with my expectation about the indicator. I was tempted to add the indicator in the past and quickly found that there's no Unicode character (yet) for this purpose, using an image is not my taste. So I hesitated to add it. Now, when you see a strange character after the link, you know the link will go to another website and it will open in a new tab.