Letter, Character, Symbol
The roof child stands upon the roof, holding up a single letter, a single character, a single symbol for the world to see.
More people can see this character since the kid is on the roof.
じ
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The character that is being shown is "J," which stands for Jesus (じ). The kid wants everyone to see this letter and symbol.
Imagine the child holding up the letter yelling at everyone who passes that the "J" stands for "Jesus." And yes, this kid just loves the Big Lebowski.