The best replacement for single phase is three phase.

The best alternatives to single phase are rated as following:
★★★★★  three phase
★★★★  three phase power
★★★  3 phase
★★  three phase motor
★★  2 phase
★  3 phase motor
★  two phase
★  triple phase
★  double phase
★  three phase electricity
★  3 phase electricity
★  three phase generator
★  dual phase
★  three phase wiring
★  3 phase power
★  3 phase wiring
  three phase electric
  3-phase
  3 phase generator
  three phase system
  3 phase motors
  three phase motors
  three phase transformer
  3 phase electrical
  split phase
  3 phase air conditioner
  220v 3 phase
  three phase current
  3 phase which is better
  three
  three phase transformers
  3 phase efficiency

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Speaking about single phase, one probably shouldn't forget about 3 phase motor.

Other search terms related to single phase and their ratings are:
★★★★★ 3 phase motor
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Google Trends

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single phase
three phase
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