Oil dip stick

What does the 4 holes at the end of the dip stick mean ?

It helps control the weight of the vehicle by removing unnecessary material…

Probably to identify which engine it was made for. There must be a dipstick factory somewhere that gets a lot of business.

I have not seen that for a while. The ones I know of were there to make it easier to see the oil level. It might even have been down by the owner for the same reason. I suspect that with two or three holes covered means OK.