Symbol: 
Definition:
The slope modifying symbol is placed with a value to indicate that this value is controlled as a slope, or a “flat taper.” The value listed with the symbol is the ratio of the height change to length change, as shown below in Figure 1.
Figure 1: Slope Value
Application:
When applying the slope symbol to a print, the symbol is always represented with the vertical leg on the left, regardless of the actual direction shown on the drawing. The dimension of the slope is also commonly listed as a basic dimension. This is because the slope value is dependent on the height and length dimensions from which it is calculated. A slope is illustrated in Figure 2, with the slope symbol highlighted in green.
Figure 2: How to Indicate a Slope
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