Exact value is the value that is correct in measurements, such as cm, km, and etc. It is widely used in fields of science and math.
However, true value is used when reviewing the art work, or etc., such as saying this piece of art drawn by somebody has a true value. It means that it is very high when estimating the value of a certain thing. It is widely used in fields of ART.
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True means correct, factual. False is the opposite - it means not true or not correct.
If it's high that means it's very off and away from the actual value. If you find a low percent error it is very close or close to the true value.
Paint is made by True Value.
9f you are using the equation %error =[(oberved value - true value)/true value]x100 a negative percent indicates the observed value is less than the true value by the calculated percent.
A key is the name of a variable in an array ($array["key"]) and the index is the position it's at ($array = ["key" => 0], the index would be 0). Keys and indices are the same if the array is not associative though ($array = [true], the key holding the value true is named 0 and is at index 0).