"stereos" in the noun sense
1. stereo, stereophony, stereo system, stereophonic system
reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound
2. stereo, stereoscopic picture, stereoscopic photograph
two photographs taken from slightly different angles that appear three-dimensional when viewed together
Source: WordNet® (An amazing lexical database of English)
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