ISO-2022-jP is a character encoding system for Japanese characters used on the internet(especially e-mail). It is characterized by being a 7-bit code that switches the character set using the ISO / IEC 2022 escape sequence (the escape sequence of the announcement function is omitted). There are also sometimes called “JIS code”.
SCII letters, kanji for JIS x 2008 etc, can be used, but half size kana characters etc can not be used.