A common term used in web analytics is bounce rate. It is regarded as the visitors who do not stay on your site, but they simply click on your site and then they leave your site. It is measured as a percentage. There is a formula that is used to measure and calculate the bounce rate. It is the total visits and the single page visits divided into that.
This is not necessarily the best thing to have because it shows that people may go to your site, but then they leave because your site is either not helpful, functional or useful. It may be hard for them to find anything. It also may not be appealing to the visitors.