What does the next to a search result listing mean?
The next to a search results is an infinity symbol, and appears for all documents that NLM has assigned permanence ratings and other metadata. Click on the infinity symbol to view the permanence information for that document. Permanence information includes: title, URL, date last updated, date first published, permanence level, and a link to all of the metadata for the document. Click “Permanence level” to see the definitions of NLM’s four permanence levels. NLM uses permanence levels to indicate which NLM Web documents can change, and which will remain permanently available. For more information, please see Developing Permanence Levels and the Archives for NLM’s Permanent Web Documents.
