What does the "H" next to a screw mean?

Question

laptops

Hello.
Please tell me what the symbol “H” next to the screw in the photo means:



There is the same symbol next to the upper right screw, but there is no such symbol next to the other screws ...

Answer 1

Thread type:
en.wikipedia.org/wiki/ISO_metric_screw_thread#Designation

External threads are designated by lowercase letter, g or h. Internal threads are designated by upper case letters, H or G.