nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
Amazon hosting services.
The DOCTYPE is a required preamble for HTML5 websites.
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.
Sites who has this tag are verfied by google to use WebMaster tools
Wesites using favicon rel tag