Chip 3nm, 5nm, 7nm refers to a chip using 3nm, 5nm, 7nm process, and nm is naturally short for length unit nanometer. Simply speaking, x nm refers to the gate width of the complementary oxide-metal semiconductor field effect transistor formed on the CPU, also known as the gate length. To explain in detail, the current flows from the Source into the Drain stage, and the Gate is equivalent to the gate, and the on-off of the source and the drain stage at both ends is controlled by the gate.
The current will be lost, and the width of the gate determines the loss when the current passes through, which is reflected in the common heat and power consumption of mobile phones, the narrower the width, the lower the power consumption. The minimum width of the gate (gate length) is the value in the X nm chip process.