Hildegard Code

Hildegard Code is a type of code system used for Princess Hildegard's friends, people who liked the series which mentions Elena (Liftland, Poland or Korea), tracking individual characters and can be seen in the top left corner of the timesheets used by Hildegard's friends. The system was created by Princess Hildegard.

for Princess Hildegard's friends (Code VIII)
When a character becomes Hildegard's best friend, Princess Hildegard assigns a Hildegard Code in the format HGD jgiiiyyyymmsssccrrrrrxx, where: The first character represents the skin colour, for example, 6 means almost white.
 * j is the 'skin colour', 0 for black to 7 for white; 8 or 9 for other colour.
 * g is either 'M' for a boy, or 'F' for a girl;
 * iii is the initials of the character's full name;
 * yyyymm indicate the month and year of first appearance;
 * ssscc refer to the state and country of origin;
 * rrrrr is the character's ID;
 * xx is the 'controlled number', 01–97, calculated using MOD 97-10 as defined by ISO 7064

The next character indicates gender, followed by three encode the initials of character's full name. The next six are the year and month of first appearance. The group ssscc is the 'location', and it consists of five digits. For example, 0NYUS indicates that the character is from New York, NY, USA.

The next five characters are the character's ID, and it consists of five digits and it is unique.

The last two characters are called 'control numbers'. These were done by adding '00' to the right end of the Hildegard Code, then converting letters to numbers, and taking the whole intenger by modulus 97 and subtracted from 98: this gives the control number.

Korea (Code IV)
In Korea, Hildegard gives the format of HGD jjjzzzzzzzrrrrrrrrrrrrrkkkknnnxx, where: To calculate controlled number: The completed number is HGD BNM065181095090315441581210APK16.
 * jjj is the prefix three-letter series; running from BBB to YYY;
 * zzzzzzz is the zip code where the person who loves Elena resides in;
 * rrrrrrrrrrrrr is the 13-digit RRN (resident registration number);
 * kkkk are random digits;
 * nnn is the three-letter series, running from AAA to ZZZ;
 * xx is the 'controlled number', 01–97