There is a special type of small hole in PCBs that looks like the edge of a stamp, so it is called a "Stamp Hole". Have you seen it? The so-called Stamp Hole is actually a row of small holes made by Half-Holes or V-Cut. It is often used to divide a large Panel into smaller boards. Its advantage is that it facilitates Depaneling; during production, multiple small boards are assembled together to improve efficiency and facilitate soldering.
 
Half-Holes can also be used for Module Packaging. Processes like this are common in Wifi Modules and Bluetooth Modules, which saves costs and reduces Fixture and processing expenses. Don't underestimate this row of small holes; it is a key detail that ensures Modular Design and Mass Production!