67@67

Could you clarify what the symbol “@” means here? It isn’t standard in math, so I need the intended operation to compute it. Here are a few common interpretations and their results:

• If @ means exponent: 67^67 ≈ 2.22 × 10^122 (about 123 digits).
• If @ means binomial coefficient: C(67, 67) = 1.
• If @ means factorial: 67! ≈ 2.35 × 10^94 (about 95 digits).
• If @ means a modulo-like operation (e.g., 67 mod 67): 0.
• If you’re using Mathematica-style f@x notation, 67@67 is invalid since 67 isn’t a function.

If you can tell me the exact meaning or the exam context, I’ll give a precise result or a full solution.