Alternative at sign `@` (ss06) (closes #617 closes #748 closes #817)

CHANGELOG.md

@@ -60,6 +60,7 @@ All notable changes to this project will be documented in this file.
   - Ampersand `&` (ss03) [#617]
   - Dotted zero `0` (zero, ss04)
   - Dollar sign `$` (ss05) [#617]
+  - At sign `@` (ss06) [#617] [#748] [#817]
 
 
 #### 1.207 (April 6, 2019)