Feature of this puzzle’s circled squares that, when connected by a single line, visually represents 111-Across

DOUBLE-O

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The circled squares in this puzzle each contain the letter "O," and when you connect them with a single line, they form two overlapping "O" shapes—visually resembling the spy code "00" (pronounced "double-O"). This mirrors the answer "DOUBLE-O," which is also the shorthand for a famous fictional spy designation like James Bond’s. The clue hints at both the literal appearance of the circles and the cultural reference tied to espionage.