The icon for the Saturation effect.
Saturation is a Status Effect found in Minecraft that was added in 1.6. This status effect works in a similar way to Regeneration, except that it affects the hunger bar instead of the health bar. For every level, it restores 1 (
) per tick, which amounts to the full hunger bar per second on level 1.
Like all status effects, it can be removed by drinking Milk.