The best replacement for ln is log.

The best alternatives to ln are rated as following:
★★★★★  log
★★★  ln
★★  log10
★★  e
★★  un
★  loge
  log graph
  log excel
  natural log
  log 10
  pn
  exp

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Speaking about ln, one probably shouldn't forget about units.

Other search terms related to ln and their ratings are:
★★★★★ units
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