Step 1: Understand the Condition

We need to find symbols that are immediately preceded by a number (Left neighbor = Number) and immediately followed by a number (Right neighbor = Number).

Step 2: Scan the Given Series

Series: 7 3 @ 1 7 3⁴ & 3 Omega 9 # * Pound 5. Checking symbols one by one from left to right:

Step 3: Evaluate Each Symbol

1. Symbol '@': preceded by 3 (number), followed by 1 (number) → Valid (3 @ 1).
2. Symbol '^{\prime}: preceded by 3 (number), followed by 4 (number) → Valid (3⁴).
3. Symbol '&': preceded by 4 (number), followed by 3 (number) → Valid (4 & 3).
4. Symbol 'Omega': preceded by 3 (number), followed by 9 (number) → Valid (3 Omega 9). Wait, let's verify Omega: 3 Omega 9 → preceded by 3, followed by 9. That makes 4 valid symbols total! Let's recount carefully: 7 3 @ 1 (3@1) → 1; 7 3⁴ (3⁴) → 2; 4 & 3 (4&3) → 3; 3 Omega 9 (3Omega9) → 4. Total count = Four.