I was writing a python 3 code and the number seem correct. Except can someone explain to me what b'& means. As you can see it is also in the information for byte string as well. I am not sure what x00& means in the string b'\x00&\x01\xff\xd8\xff' and I need some clarification. Thank you

Sending data packet to receiver with sequence number = 0 checksum = b'&\x01' file data lenght = b'\xff\xd8\xff' ' ' packet value = b'\x00&\x01\xff\xd8\xff'