The best replacement for ansi is iso.

The best alternatives to ansi are rated as following:
★★★★★  iso
★★★★★  asme
★★★★  unicode
★★★★  ascii
★★★★  astm
★★★★  utf-8
★★★  osha
★★  din
★  api
★  iso standards
★  utf
★  iec
★  asme flanges
★  ada
★  vt100
★  unicode pst
  din flanges
  ieee
  snell
  iso keyboard
  din flange
  arch
  nist
  api pumps
  lumens
  astm standards
  utf 8
  csa
  utf8
  tfla
  asa
  asme flange
  aisi
  cpsc
  etsi

Your alternative for ansi is not listed? Suggest!
Speaking about ansi, one probably shouldn't forget about utf 8.

Other search terms related to ansi and their ratings are:
★★★★★ utf 8
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Google Trends

Scale is based on the average worldwide traffic of ansi in all years. Click on graph for more.
ansi
iso
asme