The notation "φ(7)" refers to the Euler's totient function, which counts the number of positive integers up to 7 that are relatively prime to 7. Two numbers are considered relatively prime if their greatest common divisor (GCD) is 1. Since 7 is a prime number, all integers less than 7 are relatively prime to it. To calculate φ(7), we can list the integers from 1 to 6: 1, 2, 3, 4, 5, 6. Each of these numbers has a GCD of 1 with 7, meaning they are all relatively prime. Therefore, φ(7) equals 6, indicating that there are six integers less than 7 that are coprime to it.