Arhitectural Symbols and Orthographic Projection

So this time , i am gonna show you some of symbols that is often used in designing. 

Take a look! :3 

 

And the other thing is an orthographic projection of a cylinder and a cone. 

Hahahah i know the lines are not straight. It is because we are not allowed to use ruler or eraser . So forgive me senpai 😣😆