Aha, meta tags! They are special tags that you can put in the "head" section of an HTML page that are read by search engines etc. Common ones being "description" (a brief description of your site), "keywords" (a list of keywords) and "robots" (instructions on whether you want search engines to index a particular page or follow links on that page or not). So definitely useful things to have control over.
But "verify-v1" is a custom meta tag specific to Google. When you add a site to webmaster tools on Google, it gives you some HTML code consisting of a "verify-v1" meta tag, for which the value is a long string of random letters and numbers. Google then checks your web page for that tag so that it can prove that the site is yours (as you will have added the tag).
Posted via Mobile Device