Answer: I believe the word you are looking for is tolerance.
Explanation:
Some resistors have only three bands on their outer casing, which means that the tolerance band is blank. This means the tolerance has a default value of plus or minus 20 percent. For example, a 1k-ohm resistor would have an actual value that measures from 800 to 1200 ohms, since the tolerance would be 200 ohms.
