What is the abbreviation of the couple Minato and Kushina in Naruto?

Is it the abbreviation of cp, then it is Sijiu

The pairing in the Japanese comic "Naruto".

Four: Refers to Naruto Uzumaki's father, the Fourth Hokage Namikaze Minato;

Nine: Refers to Naruto's mother, Uzumaki Kushina, the former Nine-Tails Jinchuuriki.

Sijiu is undoubtedly a rare official couple in "Naruto"