Describir: Basic units in mechanical drawing

            _____     ______     ___      ____      ______    ______  
    ___    |  ___||  /_   _//   / _ \\   |  _ \\   /_   _//  /_   _// 
   /   ||  | ||__    `-| |,-   / //\ \\  | |_| ||   -| ||-     | ||   
  | [] ||  | ||__      | ||   |  ___  || | .  //    _| ||_    _| ||   
   \__ ||  |_____||    |_||   |_||  |_|| |_|\_\\   /_____//  /__//    
    -|_||  `-----`     `-`'   `-`   `-`  `-` --`   `-----`   `--`     
     `-`                                                              
   ___    
  / _ \\  
 | / \ || 
 | \_/ || 
  \___//  
  `---`