The function is applying a Caesar cipher shift of 7 characters on the input string.

[CODE]:
```python
def caesar_cipher_shift_7(text):
    shifted = ""
    for char in text:
        if 'a' <= char <= 'z':
            shifted += chr(((ord(char) - ord('a') + 7) % 26) + ord('a'))
        elif 'A' <= char <= 'Z':
            shifted += chr(((ord(char) - ord('A') + 7) % 26) + ord('A'))
        else:
            shifted += char
    return shifted
```