watermark

Definitions

• A translucent design impressed on the surface of paper and visible when the paper is held to the light.
• (by extension) A logo superimposed on a digital image, a television broadcast, etc.
• (computing) 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.
• A mark indicating the level to which water has risen.