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Shyabae1
Boo Radley symbolized the "Grey Ghost" he's elusive,.scary unknown.

I'm telling you what I remember, I haven't read this book in 3 years, but I loved it I'm pretty sure you can look the answer up online to.

Answer:

this may be wrong but: I think that Boo Radley symbolized the Grey Ghost.

Explanation:

He is Scout's benevolent ghost who looks pale with "colorless eyes"and looks "dead and thin."