What does "X" represent in the following symbol? 
X
Definitions:
Foreign Country
A nation-state or territory that is recognized as independent and distinct from one's own country, governed by its own political and legal systems.
Mechanical Engineer
A professional engineer who designs, analyzes, and maintains mechanical systems.
Fossil Fuel
A natural fuel such as coal, oil, or natural gas, formed in the geological past from the remains of living organisms.
Water
A transparent, tasteless, odorless, and nearly colorless chemical substance that is essential for most known forms of life and used in many industrial processes.
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