What is a Silicon Semiconductor PN Junction?

In silicon semiconductors, PN typically refers to the "Positive-Negative" structure, which is the junction between the positive region (P-region) and the negative region (N-region). Positive                     Negative

This structure is formed by p-type (positive-type) and n-type (negative-type) semiconductor materials. In this structure, the doping in the P-type semiconductor region contains positive ions (such as boron), while the doping in the N-type semiconductor region contains negative ions (such as phosphorus or arsenic). The English abbreviation for this structure is PN junction.

Note that PN here refers to the structure, not the abbreviated meaning of PN.