Super Yellow Lum
In Rayman 2
These are found in all versions of Rayman 2 except for the Game Boy Color adaptation. However, they do not appear in Rayman Revolution. They can be recognized by their big faces and their typical size. In Prima's Official Strategy Guide for Rayman 2, they are referred as “Five-Pack Yellow Lums”.
It resembles a larger Yellow Lum, with a grinning face. When Rayman collects one, it counts as five normal Yellow Lums, suggesting that Super Yellow Lums are formed of five Yellow Lums joined together, in the same fashion that the Heart of the World is formed of 1000 Yellow Lums. In Rayman Revolution, each of the 1000 Yellow Lums must be found separately; there are no Super Yellow Lums. They can also be found in the Gameboy Color remake of Rayman 2. They instead have a value of ten Yellow Lums.
Super Yellow Lums are not present in Rayman DS, but can be seen in the pause menu.