The best replacement for em is en dash.

The best alternatives to em are rated as following:
★★★★★  en dash
★★★★★  px
★★★★  i
★★  percent
★★  rem
★★  strong
★★  pixels
★  pixel
★  ex
★  lose em
★  px responsive
★  im
★  i tag
★  dm
★  anesthesia
★  bee
  fold em
  sit em
  start em
  mame
  b
  px which is better
  en
  eth
  surgery
  px css
  pixels css
  percentage
  k means
  en dashes
  px vs
  leave em
  percent css
  rem css
  percentage css
  benzino

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Google Trends

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em
en dash
px