Create your own encrypted fashion
Very old encryption from Caesar that replaces each english letter with the one 13 places forward or back along the alphabet. Often used in usenet or geocaching.
International spelling alphabet
German spelling alphabet
Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. The particular set of 64 characters chosen to represent the 64 place-values for the base varies between implementations. The general strategy is to choose 64 characters that are both members of a subset common to most encodings, and also printable.