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Meaning of square brackets "[]" when querying RDF with SPARQL?

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I am pretty new to SPARQL and RDF and I was wondering what exactly does the below mean in SPARQL?

[] vc:n ?vcard .

The complete query is

PREFIX vc: <http://www.w3.org/2006/vcard/ns#>SELECT ?given ?familyWHERE{    [] vc:n ?vcard .    OPTIONAL {?vcard vc:given-name ?given .}    OPTIONAL {?vcard vc:family-name ?family .}}

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