What is the missing symbol in this plutonium fission reaction? 
Definitions:
Benchmarks
Standard points of reference against which things can be compared or assessed to measure the quality or performance.
Performance Improvement Plan
A formal plan developed to help employees improve their performance in specific areas that have been identified as deficient.
Performance Management Plan
The documented plan of performance objectives set for the employee to achieve over the upcoming appraisal period.
Recency Effect
Refers to the psychological phenomenon where the most recently presented information is more likely to be remembered than older information.
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