The most common variety of the Poké Ball.
In the anime and apparently most fanart, it has a simple red/white design.
In the games, it has the same design, but is often orange/white instead.
Naturally, it may be found in monochrome posts too.
Compare the tag Poké Ball, which encompasses all varieties of the Poké Ball, including Master Balls, Cherish Balls, Quick Balls, etc.
The following tags are aliased to this tag: poke_ball_(generic) (learn more).
This tag implicates poke_ball (learn more).