I should just have put the printable character chart right here in the post for people to compare: 0 1 2 3 4 5 6 7 8 9 A B C D E F .. 2 ! " # $ % &

I should just have put the printable character chart right here in the post for people to compare: 0 1 2 3 4 5 6 7 8 9 A B C D E F .. 2 ! " # $ % & ' ( ) * + , - . / 3 0 1 2 3 4 5 6 7 8 9 : ; < = > ? 4 @ A B C D E F G H I J K L M N O 5 P Q R S T U V W X Y Z [ \ ] ^ _ 6 ` a b c d e f g h i j k l m n o 7 p q r s t u v w x y z { | } ~ I don't have a mnemonic for punctuation characters with second nibble >9, or for the backtick. The @ can be remembered via Ctrl+@ which is a way of typing the NUL character, ASCII 00 (also not coincidental; compare to Ctrl+A, Ctrl+B, Ctrl+C... for inputting ASCII 01, 02, 03...).