BlueRL, LNF is the three letter code used to designate the Ecotec 2.0 Direct Injected Turbo engine found in the Sky Redline. By contrast, the Ecotec 2.4 Naturally Aspirated engine found in the Base model is the LE5.
All GM engines are usually referred to this way. For instance, the V8 in the Z/28 Camaro is the LS7. The V8 found in the GTO is the LS1 and later, the LS2. The LS3 was the V8 Engine used by the Mallett company when making their models of the Sky and Solstice.