not set

Not set can be seen in a number of different reports and indicates that a particular piece of information is not available within the report. For example, in the Location report, not set indicates that Google Analytics was unable to determine someone’s exact geographic location when they accessed your website. While not set in the Source/Medium report occurs when a campaign tagged URL hasn’t been fully constructed (for example, if ‘source’ isn’t defined it will be displayed as not set within the report).