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+### Rationale:
+`$` is special in double quotes, but there are some cases where it's interpreted literally:
+
+1. Following a backslash: `echo "\$"`
+2. In a context where the shell can't make sense of it, such as at the end of the string, (`"foo$"`) or before some constructs (`"$'foo'"`). 
+
+To avoid relying on strange and shell specific behavior, any `$` intended to be literal should be escaped with a backslash.
+
+### Problematic sample code:
+
+    echo "$"
+
+### Correct sample code:
+
+    echo "\$"