What does "X" represent in the following symbol? 
X
Definitions:
Job Order
A work request specifying the details and requirements for a particular job or task, commonly used in manufacturing and service industries to organize and track production.
Forward Scheduling
Scheduling in which materials and resources are allocated for production when a job order comes in.
Materials
Substance or substances from which a thing is or can be made, often used in the context of manufacturing and construction.
Detailed Breakdown
An exhaustive analysis or explanation of a complex topic or item thoroughly separating its components.
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