Issue title: Icon Request: icon-rdf (or similar icon for semantic data)
 Issue body: A possible starting point might be the W3C SVG icon for RDF data: 

http://www.w3.org/RDF/icons/rdf_w3c.svg

 Comments: 
 Comment 0: +1

 Comment 1: +1

 Comment 2: +1

 Comment 3: +1

 Comment 4: +1
 Comment 5: +1
 Comment 6: +1
 Comment 7: +1
 Comment 8: +1
{'source': 'GithubIssues', 'repo_name_with_owner': 'FortAwesome/Font-Awesome', 'issue_id': 14916867, 'repo_stars': 70355.0}