Stećak is the name for monumental medieval tombstones, that lie scattered across Bosnia and Herzegovina, and the border parts of Croatia, Montenegro and Serbia. An estimated 60,000 are found within the borders of modern Bosnia and Herzegovina and the rest of 10,000 are found in what are today Croatia (4,400), Montenegro (3,500), and Serbia (2,100), at more than 3,300 odd sites with over 90% in poor condition. They are cut in a variety of recognizable stećak forms, with certain percentage being richly decorated and some individual stećci also containing inscriptions in form of epitaphs.

Stećak forms, that is, shapes and dimensions of the megalithic tombstone known as stećak, is what make stećaks extremely attractive. Stećaks are mostly of large dimension and in rare cases smaller ones were cut. However, the very basic division of stećak is between lying or horizontal and standing or vertical ones, which was introduced by Dimitrije Sergejevski in 1952. The first group includes stećci in the form of a slab, a chest, a chest with a pedestal, a gable and a gable with a pedestal, while the second group includes stećci with two forms - columns and crosses. In addition to these basic forms, which have several subtypes and variants, there are also amorphous stećci, which are simplest ones and usually without any elaborate finishing decorations or inscriptions.