DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   
   ** English
   [wikipedia]
   
   *** Noun
   [en-noun]
   
    1. [en]  A negligible set ; set of zero measure .
    2. [en]  The empty set .
   **** Translations
   [negligible set]
   
    - Bulgarian: [bg]
    - Finnish: [fi]
    - French: [fr]
    - German: [de]
    - Italian: [it]
    - Polish: [pl]
   [trans-bottom]
   [empty set]
   
   *** Anagrams
   
    - [en]