What does "X" represent in the following symbol? 
X
Definitions:
Predetermined Standards
Benchmarks or criteria established before the start of a process or project to guide performance and outcomes.
P-Chart
A quality control chart that is used to control attributes.
Process Sampling
The technique of selecting a sample of elements from a process for analysis, to determine the quality or performance of the process.
Acceptance Sampling
A statistical quality control method used to determine whether to accept or reject a batch of products based on a sample of items from the batch.
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