Drawing of a rock retaining wall on a sloped hillside entitled 'Rock Retaining Wall Terminology'.

• The 'Outslope' is labeled with text and an arrow pointing out away form the hill.
  
  
• The 'Tread' is labeled with text and arrows showing the width of the tread.
  
  
• The slope of the wall is illustrated with a triangle and the text 'Batter: The amount that the wall leans into the hillside.'
  
  
• The foundation stone is labeled with an arrow and the text 'Foundation course: The bottom layer of rock that provides a stable and insloped base—usually the largest rocks. They must be keyed into solid ground, not fill.'
  
  
• The second stone from the top is shown with an arrow and labeled with the text 'Tie stone or header rock: Rock that is longer to extend or "tie" the wall into the backfill.
  
  
• The top rock is shown with an arrow and labeled with the text 'Capstone: Rock with sufficient mass and/or shape to provide a stable top course.'
  
  
• The smaller rocks piled up under the tread are shown with and arrow and labeled with the text 'Backfill: Mineral soil and/or small rock.