What does "X" represent in the following symbol? 
X
Definitions:
Phantom Limb Sensations
refer to the perception of sensations, often pain, in a limb that has been amputated, indicating brain and nerve involvement.
Sensory Input
Information received by the senses such as sight, sound, touch, taste, and smell, that is then interpreted by the brain.
Peak Moment
The highest or most intense point in the development or resolution of something.
Physical Pain
An uncomfortable sensory and emotional experience associated with actual or potential tissue damage.
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