And, the third is the package build number. All three are seperated by dashes. The package build number is important incase if there is a more recent rpm build of a program with the same version. This happens a lot with the kernel. The package name in this case is glibc-devel .
Lets work with an example.
The i query option requires a package name. Rpm is smart enough to use the package name without the version info. This command should look similar to the previous one. All we did was replace the i with an l to get a listing of files installed by the faq package. The -i is the install switch.