Halo: Reach skulls
From Halopedia, the Halo wiki
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As with Halo 3, Halo: Reach has difficulty-multipliers in the appearance of human skulls. In addition, all of the skulls featured in Halo 3 will be included in Reach.
Cloud
The Cloud skull is a new skull featured in Halo: Reach.[1] When the skull is on, the player's Motion Sensor is disabled, similar to the Fog skull in Halo 3.[2]
Yellow
Revealed in Firefight, Yellow is one of the custom made skulls you can have .