How long before they fuck it up?

So in simple diagrams like this for problem solving I've over time came to recognize and understand what the different symbols and elements mean, such as pins/rollers, force and force distributions, etc. This is all relatively fundamental and important to convey the phenomena of occurrences that happen in crafting diagrams such as work problems for school. That said I never learned exactly what this kid of technical art is called nor was I ever given what I consider a sufficient background in it. Even simple concepts like the diagonal lines used to denote the rigid immobile floors/walls of the environment I have no clue what to refer to as simply.
Is this sort of pictorial representation used so simply in the professional/scientific world and how developed is it? I want to learn formal terms and expand my knowledge of more common terms and symbols, such as the roller contact points characterized by circles in pic related.

https://123abcmathematics.blogspot.com/

Check out my blog. In a beautiful 10 step proof I show that the Continuum Hypothesis is false.

This board is an absolute dumpster fire. Mods what the actual fuck? At this point /x/ is a better board for having interesting science discussions.

Hello /sci/, how do I become more logical? I've been teaching myself upper level linear algebra, will this make me more logical? If not, any tips on how to become logical?

While you're busy spreading your antiscience nonsense, Pfizer has been saving millions of lives across the globe.

https://www.youtube.com/watch?v=ybVCUnL3bnI
is this a good simplification?

Why does science consider Joe Rogan's interview with Dr. Malone to be more offensive than murder and child rape?

A much better one, that's for sure.
Don't listen to those who say we owe it all to science, great inventors never come from academia, and working class people who built everything up are not scientists.

Can somebody explain why lockdowns work?