Why do I always seem unable to understand mathematical terminology?

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As I ask more and more maths questions, the issue of terminology becomes ever greater for me.

While I feel that my maths is progressing, and is in fact knowledge-wise beyond others people of my age, I appear to be unable to understand a lot of terminology.

For example, take an answer I recieved to a question yesterday: enter image description here I understand all the maths about sines and cosines that he is talking about, but for some reason I always seem to get confused. "What does s sin 0" mean? "What is the 'speed' for a object travelling in a 3D world"? "What is gd"?

I'm not trying to get these specific questions answered, but I am pointing it out as an example of that even though I know all the maths he is talking about, I cannot understand a thing he is saying because I cannot understand the terminology.

Obviously questions like What do the dots and arrows on this article mean? are simply a lack of knowledge on my part. However, when it is about something I know all about, it worries me.

Where is the issue? Do I just not understand the notation well enough? Are people writing these documents poorly? Or is there something wrong with me that means I can't seem to understand this stuff?

What should I do to try and solve the issue of not understanding the terminology being used?