It consists of a zero sign, with an inscription on its pedestal reading "KM" for kilometres.
The present sculpture is the work of Miklós Borsos and was erected in 1975.
The first official monument, a Madonna statue by Eugene Kormendi had been set up at this spot in 1932, but was destroyed in World War II.
[1] A second sculpture, depicting a worker, was in place from 1953 until its replacement by the current one.
It is located in a small park at Clark Ádám tér (Adam Clark square), at the Buda abutment of Chain Bridge, below Buda Castle.