what is the meaning of the following command and why its not given at help menu of nmap? : sample command:sudo nmap -sP -n 192.168.0.0-255

sample output:

Starting Nmap 7.60 ( https://nmap.org ) at 2017-10-14 16:09 +06
Nmap scan report for 192.168.0.1
Host is up (0.0035s latency).
MAC Address: 20:L6:A7:55:3D:44 (D-link Technologies)
Nmap scan report for 192.168.0.104
Host is up (0.20s latency).
MAC Address: 18:97:F8:15:26:D9 (Zen Mobile Communication Technology)
Nmap scan report for 192.168.0.118
Host is up.
Nmap done: 256 IP addresses (3 hosts up) scanned in 6.31 seconds



what does -sP mean and why is it used? This command works properly but it is not listed to man and help menu...Please elaborate the circumstances