The May 7th Tung pattern is the deputy family pattern of the Japanese royal family, the main family pattern is a 16% fold chrysanthemum pattern, and the May 7th Tung pattern is the special badge of the Japanese Prime Minister, representing the Japanese government (Baidu).
Japanese passports have a 16% discount chrysanthemum pattern, and ID cards have a 57% discount tung pattern.
The University of Tsukuba uses five or three tung patterns as its emblem, which is really awesome. Tung pattern is very important, and it can't be used casually by ordinary people.
This is the original Japanese I found.
Chapter "Five-Three Tung Leaf Types" of Tsukuba University. これは1903 にされたがでぁりがでぁ 1949 Making "Tokyo University of Education Students". Use the arms of "May 3 Directors", "Hu" and "Sun".