CPV code 55243000 designates Children's holiday-camp services in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
55243000 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 55240000 (Holiday centre and holiday home services).