But  is only 1 full turn in terms of radians. When you say turns you mean full revolutions, so 1 full turn is just that: 1. Radians divided by tau is equal to the number of full turns, maybe we should put them together? Hence: 
 {|class = wikitable 
 ! Units !! colspan=10 | Values 
 |- valign="top" 
 |style = "background:#f2f2f2" | Turns or Radians divided by     
 |style = "width:3em; text-align:center" | 0 
 |style = "width:3em; text-align:center" | 1/12 
 |style = "width:3em; text-align:center" | 1/10 
 |style = "width:3em; text-align:center" | 1/8 
 |style = "width:3em; text-align:center" | 1/6 
 |style = "width:3em; text-align:center" | 1/5 
 |style = "width:3em; text-align:center" | 1/4 
 |style = "width:3em; text-align:center" | 1/2 
 |style = "width:3em; text-align:center" | 3/4 
 |style = "width:3em; text-align:center" | 1 
 |- valign="top" 
 |style = "background:#f2f2f2" | Degrees (°)    
 |style = "width:3em; text-align:center" | 0 
 |style = "width:3em; text-align:center" | 30 
 |style = "width:3em; text-align:center" | 36 
 |style = "width:3em; text-align:center" | 45 
 |style = "width:3em; text-align:center" | 60 
 |style = "width:3em; text-align:center" | 72 
 |style = "width:3em; text-align:center" | 90 
 |style = "width:3em; text-align:center" | 180 
 |style = "width:3em; text-align:center" | 270 
 |style = "width:3em; text-align:center" | 360 
 |- valign="top" 
 |style = "background:#f2f2f2" | Radians 
 |style = "text-align:center" | 0 
 |style = "text-align:center" |  
 |style = "text-align:center" |  
 |style = "text-align:center" |  
 |style = "text-align:center" |  
 |style = "text-align:center" |  
 |style = "text-align:center" |  
 |style = "text-align:center" |  
 |style = "text-align:center" |  
 |style = "text-align:center" |  
 |- valign="top" 
 |style = "background:#f2f2f2" | Grads (g) 
 |style = "text-align:center" | 0 
 |style = "text-align:center" | 33⅓ 
 |style = "text-align:center" | 40 
 |style = "text-align:center" | 50 
 |style = "text-align:center" | 66⅔ 
 |style = "text-align:center" | 80 
 |style = "text-align:center" | 100 
 |style = "text-align:center" | 200 
 |style = "text-align:center" | 300 
 |style = "text-align:center" | 400 
 |}