What is the missing symbol in this plutonium fission reaction? 
Definitions:
Ambulation
The act of walking or moving from one place to another, often used in medical contexts to refer to a patient's ability to walk independently or with assistance.
Postoperative Patient
Refers to a patient who is currently in the recovery phase following a surgical procedure.
Passive ROM Exercises
Physical therapy exercises where an external force, such as a therapist, moves a joint through its range of motion without the patient's active participation.
Joint
A point at which two or more bones meet, allowing for movement and support in the skeletal system.
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