The lines inside the 5-nanometer chip are 5 nanometers.
Nanometer is a unit of length, and 5 nanometers is the smallest silicon transistor gate width inside the chip, 5 nanometers chip is made up of countless 5 nanometers silicon transistors. Of course, different foundries of the chip, the internal line density is not the same. For example, Snapdragon 8Gen1 uses Samsung's 4nm process with a transistor density of about 167 million \/mm2, which is still slightly lower than TSMC's 171 million \/mm2 5nm process.
The \"nanometer\" in the photolithographic nanomachine refers to the product line width (process size). That is, the chip line size machined by photolithography can reach the order of nanometer, that is, 10^(-19)m,