Resonance Rings are a gameplay mechanic in Dark Souls.
Resonance Rings appear in an area where another player has recently used a miracle. It is possible to find multiple Resonace Rings at once. Resonance rings appear as small white rings fixed slightly above the ground. When the player is close to one, the power of certain Miracles is boosted. When the player is close enough so that their miracles can receive a boost, a white circle will appear over the selected miracle.
The effect of resonance rings does not stack; standing next to two or more resonance rings has the same effect as standing next to one resonance ring. Wearing the Ring of the Sun Princess grants a boost to miracles equivalent to that of being close to a resonance ring. The effects of the Ring of the Sun Princess stack with resonance rings.
See Miracle Synergy for more information.
Prior to patch 1.06, resonance rings did not work on the PS3.