Potential answers for "Subtle signal"

⭐⭐⭐⭐ WINK
⭐⭐⭐⭐ PSST
⭐⭐⭐⭐ NOD
⭐⭐⭐⭐ CODEWORD
⭐⭐⭐ SLYNOD
⭐⭐⭐ SOCIALCUE

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