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"Host discovery" is the preferred term over "ping scan" because of confusion with ICMP Echo Request, a.k.a. "ping" as used by the "ping" utility. Warn when users use -Pn because it has negative impact on scan times since ultrascan timing parameters fall back to slow initial defaults.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( https://nmap.org ).