Features of size and location.
Here is a quick reference chart covering tolerances of form, profile (location of surfaces), orientation,
location (holes), and runout.
When analyzing a linear tolerance stack up, if you take the root sum square of your tolerances, there is a very good probably your limits will fall within this zone. If you have just a few tolerances and you feel lucky you can take the root mean square of your tolerances.
The square root of the sum of the square of the tolerances. See Figure 1, below.
The square root of the sum of the square of the tolerances divided by the number of tolerances. See Figure 1, below.