Roto-Disc

Roto-Discs   (also formatted as Rotodiscs, Roto Discs,   and Roto-discs ), or simply Discs, are Fire-Bar- and Spinner-like obstacles that first appear in Super Mario Bros. 3. Roto-Discs are found orbiting gray or red orbs, on which it is possible for Mario or Luigi to stand. Roto-Discs are nearly invulnerable; they can be destroyed if Statue Mario lands on top of one. Duo-Roto-Discs can also be found, and they consist of two Roto-Discs circling the central orb. If the player destroys one, the other will disappear.

Aside from Super Mario Bros. 3 and its subsequent reissues, the only other appearance of Roto-Discs is in the Mini-Mario course in Bowser's Castle in Mario & Luigi: Superstar Saga and Mario & Luigi: Superstar Saga + Bowser's Minions. As a throwback to the previous games, they are obstacles that will send Mario back to the beginning of the area if they connect with him.

Super Mario Land contains similar Roto Discs that similarly orbit a block and share the same attack pattern.

Super Mario Land 2: 6 Golden Coins also contains an enemy known as a satellite in the Mario Zone, and it behaves in a similar fashion.

Perfect Ban Mario Character Daijiten
''' クッキー 　ゴースト族 　きまじめ ゲーム　3 ''' 安全地帯て一息つにう 玉を中心に、クルクル回るファイア系のゴース卜族. 赤い玉の上はどんなときも安全地帯なので、ここでタイミングをはかって抜けていこう.

 Roto-Disc  Tribe: Ghost clan Disposition: Too serious Game appearances: 3 ' Let's take a breather in the safe zone ''Fire ghosts that spin around a ball. The top of the red ball is a safe zone at all times, so use this area to get out of the way at the right time.''

Trivia

 * In Wario's Woods for the SNES, activating a combo causes an energy orb to appear and refill Birdo's time gauge. The sprite used for the orb is the same as the Roto-Discs, only with a different palette.
 * A sign reading "ROTO DISC" appears in the 1993 Super Mario Bros. film. According to production designer, the Roto-Discs were imagined as the energy-conversion engines used in the electric Dinohattan cars.