The best replacement for parentheses is parenthesis.

The best alternatives to parentheses are rated as following:
★★★★★  parenthesis
★★★★  brackets
★★★  commas
★★  brackets math
★★  dashes
★★  parentheses
★  brackets algebra
★  outside
★  exponents first
★  bracket
★  square brackets
★  dash
★  em dash
★  after
★  brackets for domain and range
  brackets first
  hyphen
  comma
  braces
  parens
  italics
  hyphens

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

Other search terms related to parentheses and their ratings are:
★★★★★ exponents
★★★★ period
★★★ negative exponents
★★ exclamation point
★ negative numbers
★ integers
★ brackets
★ punctuation
★ periods
fractional exponents
number sentences
other punctuation
You have in mind a companion for parentheses and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of parentheses in all years. Click on graph for more.
parentheses
parenthesis
brackets