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Invincibility

From Sonic Retro

Invincibility is a power-up found in most Sonic games, obtained by breaking a monitor. It temporarily protects the player from harm, as well as allowing him to destroy most enemies by touching them. While the player is immune to most traps and attacks, it is still possible to be killed by being crushed, drowning, falling off the level, or (in Sonic & Knuckles) losing all your rings to Toxomister's smoke (which you are not invincible from).

While invincible, the player is surrounded by a sparkling effect which varies in appearance from game to game. In the 2D Genesis-era games, characters were surrounded by flickering stars, while in 3D Invincibility tends to take the form of a rainbow aura.

Items in the Sonic the Hedgehog Game Series
Collectibles   Ring | Red Star Ring | Emblem | Chaos Drives | Material
Power-ups   Shield (Water, Lightning, Fire, Gold) | Invincibility | Power Sneakers | Power Core | Light Cores
Level Objects   Monitor | Spring | Spikes | Checkpoint | Time Warp Plate | Signpost | Goal Ring | Giant Ring | Capsule | Button | Bumper | Speed Booster | Chao Container
Powerful Items   Chaos Emeralds | Super Emeralds | Master Emerald | Time Stones | Chaos Rings | Precioustone | Sol Emeralds | Jeweled Scepter | World Rings | Excalibur | Phantom Ruby
Weapons   Piko Piko Hammer | Chaos Energy Cannon | Caliburn
Devices   Remote Robot | Combi Confiner | Mother Computer | Arks of the Cosmos | Miles Electric
Other   Chili Dog | Scepter of Darkness | Nega's Camera | Cacophonic Conch