badge vs watermark

badge

noun
  • An icon or emblem awarded to a user for some achievement. 

  • A police officer. 

  • Something characteristic; a mark; a token. 

  • A small overlay on an icon that shows additional information about that item, such as the number of new alerts or messages. 

  • A carved ornament on the stern of a vessel, containing a window or the representation of one. 

  • A distinctive mark, token, sign, emblem or cognizance, worn on one's clothing, as an insignia of some rank, or of the membership of an organization. 

  • A small nameplate, identifying the wearer, and often giving additional information. 

  • A card, sometimes with a barcode or magnetic strip, granting access to a certain area. 

  • A distinctive mark worn by servants, retainers, and followers of royalty or nobility, who, being beneath the rank of gentlemen, have no right to armorial bearings. 

verb
  • To show a badge to. 

  • To mark or distinguish with a badge. 

  • To enter a restricted area by showing one's badge. 

watermark

noun
  • A logo superimposed on a digital image, a television broadcast, etc. 

  • A mark indicating the level to which water has risen. 

  • A translucent design impressed on the surface of paper and visible when the paper is held to the light. 

  • A value stored in a datafile to ensure its integrity, so that if the file's contents are changed then the watermark will no longer match the contents. 

verb
  • To mark paper with a watermark. 

  • To mark a datafile with a digital watermark. 

How often have the words badge and watermark occurred in a corpus of books? (source: Google Ngram Viewer )