A gear icon would work as well, but the intent was immediately obvious to me.
Unistrut is used extensively in the US to build support structures for electrical switchgear and process equipment. You can get grades suitable for outdoor and corrosives exposure.
Unistrut is the Kleenex term, there are a number of work-alike / fit-alike systems.
Then for round tube, there is Kee Klamp: https://keesystems.com/
Taobao (under Alibaba) has 100 times more influence on how small business in China conduct business. I know small store owners whose business were wiped out by the rise of Taobao. Amazon? They've never heard of it.
This is not basic functionality. The vast majority of iPhone users never plug their device into a computer.
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