CTR
The percentage of people who click a search result after seeing it, calculated as clicks divided by impressions.
CTR stands for click-through rate. 7 clicks from 700 impressions is a CTR of 1%.
CTR falls steeply with position: the top results take most of the clicks and the second page takes almost none. A low CTR at a good position can also mean a page is being shown for searches it does not answer, which is fixed in the title rather than the ranking.