What does 11 mean in binary code?

In binary code, the number 11 represents the decimal value 3. This is because the binary system is base-2, where each digit (bit) represents a power of 2. Specifically, the leftmost digit is 1 (which represents 2^1) and the rightmost digit is also 1 (which represents 2^0), so the calculation is 12^1 + 12^0 = 2 + 1 = 3.