The guidebook written by the Brazilian government regarding good practices in web development recommends using the following meta tags:
<meta name="target_country" content="br" />
<meta name="country" content="Brazil" />
It does not provide any explanation for why we should use them, though. The guidebook is a 10 years old document; there are visibly outdated codes there. However, that was not the case with those two meta tags: I could not find whether they are recommended or deprecated by W3C. I could not even find if they actually exist, to begin with.
Are the meta tags target_country and country useful? If so, what for? Are they endorsed by W3C, or considered a good practice by any other relevant institution, browser, social network etc.? Do they help increasing accessibility?