PR, PN and PV Variable in Yocto

PN : Represents the name of the recipe. The name is usually extracted from the recipe file name.
PR:  Represents the revision of the recipe. Default value for this revision is "r0". Subsequent revisions of the recipe conventionally will have "r1", "r2" and so on.
PV:  Represents the version of the recipe. Normally extracted from the recipe file name.

For example: ffmpeg_3.4.2.bb recipe.

${PN} : ffmpeg
${PV} : 3.4.2


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