Roughly the only good use of trigraphs these days is for obfuscated code, for example here: https://www.ioccc.org/years.html#1990_scjones https://www.ioccc.org/

Roughly the only good use of trigraphs these days is for obfuscated code, for example here: https://www.ioccc.org/years.html#1990_scjones https://www.ioccc.org/years.html#1990_scjones But trigraphs have gotten old even for IOCCC. In the guidelines for recent years, they specifically mention "We tend to dislike programs that ... obfuscate by excessive use of ANSI tri-graphs": https://www.ioccc.org/2020/guidelines.txt https://www.ioccc.org/2020/guidelines.txt