The semiconductor nanometer is the unit nanometer of the unit chip, the professional term is called the gate length, the gate length is the width of the gate of the complementary oxide metal semiconductor field effect transistor formed on the CPU.
In popular terms, the gate length can be understood as the distance between transistors or the integration of the chip, the smaller the good, the closer the transistor arrangement, the smaller the volume accounted for, and the more advanced it is.