https://markdownformatting.com/horizontal-rules
Markdown Horizontal Rule - All Three Syntax Variants with Examples
How to add a horizontal line in Markdown. Covers all three syntax variants (---, ***, ___), rules about blank lines, common mistakes, and platform differences.
horizontal ruleall threemarkdownsyntaxvariants
https://primer.style/octicons/icon/horizontal-rule-24/
horizontal-rule - Octicons | Primer
A scalable set of icons handcrafted by GitHub.
horizontal ruleocticonsprimer
https://archive.lists.launchpad.net/zim-wiki/msg03435.html
Feature Request - Horizontal Rule, Max Width : Mailing list archive : zim-wiki team in Launchpad