What are some the common roof types?

What are some the common roof types? 

There are several types of roofs available. Some of the commonly used ones include: 

• Gable roof 
• Gambrel roof 
• Shed roof 
• Half-hipped roof 
• Dutch Hip roof 
• A-Frame roof 
• Skillion roof 
• Folded Plate roof 
• Gull wind roof 
• Bell cast roof 
• Sawtooth roof