The best replacement for colon is semicolon.

The best alternatives to colon are rated as following:
★★★★★  semicolon
★★★★  dash
★★★  comma
★★  large intestine
★★  semi
★  colon
★  semicolon use
★  semicolon list
★  semicolon usage
★  hyphen
★  semi colon
★  semi-colon
★  intestines
★  semicolon before list
  comma after dear
  semicolon for list
  comma before quote
  em dash
  semicolon when making a list
  comma after salutation
  semicolon before a list
  comma before quotation
  ramos
  comma salutation
  cologne
  comma letter
  bowel
  comma quotes
  hyphen use
  rectum
  prostate
  intestine
  semicolon grammar girl
  semicolon practice
  coma
  small intestine
  stan hansen
  semicolon comma
  colon use
  question mark

Your alternative for colon is not listed? Suggest!
Speaking about colon, one probably shouldn't forget about list.

Other search terms related to colon and their ratings are:
★★★★★ list
★★ including
★★ such as
★★ an appositive
★ question
★ independent clauses
★ garcinia cambogia
★ polyps
★ enema
question mark
semicolon
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Google Trends

Scale is based on the average worldwide traffic of colon in all years. Click on graph for more.
colon
semicolon
dash