In this method, multicolored image on the blanket cylinder segment is first transferred onto a printing plate and then transferred onto a second blanket cylinder.

.STL file format in 3D printing refers to 

OPC Means

The inkjet technology in which the ink drop is generated only if the print image requires it.

The expansion for D2T2 which is a shortened term that physically and chemically defines thermal sublimation

The very fine lines of mathematically generated pattern printed on the background of a currency note is called