One's clickprint is a unique pattern of web surfing behavior based on actions such as the number of pages viewed per session, the number of minutes spent on each page, the time or day of the week the page is visited, etc..
- Clickprints on the Web: Are there signatures in Web browsing data? (pdf) a paper by University of Pennsylvania Professor Balaji Padmanabhan
- Is it possible to be identified by your 'clickprint'? from the Guardian UK