short name for Sichuan 四川[Si4 chuan1] province / one of the Three Kingdoms 三國|三国[San1 guo2] after the Han dynasty, also called 蜀漢|蜀汉[Shu3 Han4], situated around what is now Sichuan province
国
=
囗
+
玉
:
Mnemonic symbol: a nation's flag. Let's say the Chinese flag.
In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.