Ambigrams can be read right side up and rotated by 180 degrees (sometimes other rotations also exist). Some of the ones here say the same thing when turned, and some say a different, usually related, word or phrase.

Now the site makes sense. There was no content on it before and no explanation of what the site was. Just a leader board with this AM logo thing...

Edit: well, on reload, it's blank again.

Ah so it's like anagrams

Like a cross between anagrams and palindromes.

Most of the images on the site are interactable, and doing so will help visualize the various ways you get multiple meanings from a single "gram".