is the analog television standard used in Europe, Australia, and parts of South America (like Brazil). NTSC is the standard used in North America and Japan.
Files with "mixed" region tags (PAL/NTSC) are frequently custom-patched versions created by the modding community to ensure compatibility across different types of modified hardware.
While there isn't a formal academic "solid paper" on this specific file string, the title you've shared describes a version of FIFA 19 compatible with both PAL and NTSC display standards, typically distributed as a disc image ( ISO ) . Technical Specifications