The correct name is chromium-molybdenum, also known by it chemical symbols CrMo, or its AISI designation number 4130. Actually, any steel begining with 41 is CrMo, but 4130 is typically what is used in the bicycle industry.
The proper name has been morphed by our lazy-society and marketing spin doctors into various contactions, with the most common being chrome-moly. Since your sticker indicates it is a 4130 composition, the chromoly designation is just another spin.
The cheapest and heaviest materials for bicycle frames are hi-tensile steels, which are generally found on entry level bicycles. The next step up is to go to a lighter and more expensive CrMo steel. Beyond that, are butted CrMo steels which have thinner sections in the middle of the tubes for lightness, while providing thicker ends for strength where the tubes are joined together. When a tube is not butted, it is called plain or straight gauge and that is probably what you have, as the marketing guys would not miss the opportunity to flaunt butted tubes.
CrMo is a good steel for bicycle frames. The other steel of choice is manganese-molybdenum, with Reynolds 531 being the most recognizable tubeset. However, in recent years, steel has lost favour to other materials, notably aluminum, carbon fibre and titanium. Whether it is actually better than these materials is the subject of much debate.