Describir: Basic units in mechanical drawing

  ______    _____     ______     ___       _____   _    _    _    _   
 /_____//  |  ___||  /_   _//   / _ \\    / ___// | || | || | \  / || 
 `____ `   | ||__      | ||    / //\ \\   \___ \\ | || | || |  \/  || 
 /___//    | ||__     _| ||   |  ___  ||  /    // | \\_/ || | .  . || 
 `__ `     |_____||  /__//    |_||  |_|| /____//   \____//  |_|\/|_|| 
 /_//      `-----`   `--`     `-`   `-` `-----`     `---`   `-`  `-`  
 `-`                                                                  
  _____   
 |  ___|| 
 | ||__   
 | ||__   
 |_____|| 
 `-----`