Yep, this blog post is in the context of using these symbols in mathematics, where this is the only usage of << and >> that I've seen. I agree that programming

Yep, this blog post is in the context of using these symbols in mathematics, where this is the only usage of << and >> that I've seen. I agree that programming languages, it can mean various things, just like < and > mean different things in C++ vs bash vs drawing arrows.