Wikipedia
Four-thousander
A four-thousander is a mountain summit that is at least 4,000 metres above sea level. Because the highest peaks in Europe fall into this category, the summits of four-thousanders are popular in Europe with climbers and mountaineers as climbing goals. Although climbing these peaks does not require an expedition to be mounted, unlike the highest peaks in other continents, knowledge and experience of high altitude climbing is a pre-requisite for attempting these peaks.