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WWII era, semi-stainless tool steel. Very popular even today. Pretty much every steel manufacturer makes it and it's quite popular with knifemakers, custom and factory alike. Compotision-wise it's almost a stainless steel. Resists rust pretty well, good edge holding and ok toughness. Bob Dozier is perhaps the most acknowledged expert of D2 steel knives.
Alternate designations: D2(AISI), T30402(UNS), 1.2379(W-Nr), X155CrVMo121KU(UNI), BD2(BS), A681(ASTM), J437(SAE), J438(SAE), X155CrVMo121(DIN), SKD11(JIS), X160CrMoV12-28(AFNOR), 32CDV12-28(AFNOR), F520A(UNE), X160CrMoV121(EN), Airdi 150(Crucible), LSS D2(Latrobe), No. 610(Carpenter), ZCD-M(Hitachi), Z160CDV12(AFNOR), OCR12VM(Metal Ravne), 19573(CSN), Cr12MoV(GB), CPM D2(Crucible), X153CrMoV12(DIN), KAD181(Kobe Steel), Thyrodur2379(Thyssen-Krupp), DC53(Daido), KD11V(Nihon Koshuha), SLD2(Hitachi), Sverker21(Bohler-Uddeholm), DC11(Daido), R31(Mitsubishi Steel), KD11(Nihon Koshuha), KD11S(Nihon Koshuha), SLD(Hitachi), K110(Bohler-Uddeholm), 19572(CSN), X165CrMoV12(DIN), QC11(Sanyo), CDS11(Nachi Fujikoshi), RD11(Riken Seiko), QCD2(Sanyo), Amtek D2(Amtek Tool), LO-K 2379(Lohmann).