<meta name="googlebot"/>

The <meta name="googlebot"/> tag in HTML 5
<meta name="googlebot" content="noindex,nofollow"/>

The <meta name="googlebot"/> tag provides a list of search engine directives, consisting of special predefined terms separated by commas, that provide instructions for Google's search engine crawler.

noarchiveThe value noarchive indicates that a current snapshot of the page should not be permanently stored by Google. Otherwise a cached version of a web page, which shows how it looked when the page was last crawled, is available via a "Cache" link on Google's search engine results pages (SERPs).
nofollowThe value nofollow tells Google's search engine robot that it should not access any web pages linked to by the current page.
noindexThe value noindex tells Google to exclude the current page from their results.
NOODPThe value NOODP indicates that any site information in the Open Directory Project (dmoz.org) should not be used in Google's search engine results.
nosnippetThe value nosnippet indicates that verbatim content from the web page should not be used by Google in the search engine results page (SERP).