What does "X" represent in the following symbol? 
Definitions:
Informative Headings
Titles or captions that provide clear and concise information about the content that follows, aiding in navigation and understanding.
Creative Skill
The ability to generate original ideas, solutions, or artistic expressions.
Parallel Grammatical Construction
The use of matching sentence structure, phrases, or clauses for clarity, balance, and emphasis in writing.
Grammar Tools
Software or resources designed to help improve writing by checking for grammar, punctuation, and style errors.
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Q157: Which of the following is a molecular