They are becoming more and more widely used, such as in Obsidian with their "callouts": https://help.obsidian.md/Editing+and+formatting/Callouts https://help.ob

They are becoming more and more widely used, such as in Obsidian with their "callouts": https://help.obsidian.md/Editing+and+formatting/Callouts https://help.obsidian.md/Editing+and+formatting/Callouts