Upper trigram
☶
Mountain · Gen
Stillness and limit.
FamilyYoungest son
ElementEarth
Hexagram 52 of 64
☶☶ Keeping Still
The mountain doubled — stopping completely.
Lower trigram
☶
Mountain · Gen
Stillness and limit.
FamilyYoungest son
ElementEarth
The image
Mountain above, Mountain below.
Mountain over Mountain: stillness and limit meeting stillness and limit.
That combination is the whole meaning of hexagram 52. Nothing about it is arbitrary — change either trigram and you get a different hexagram with a different reading, which is why the 64 form a system rather than a list.