(classifier used before a noun that has no specific classifier) / (bound form) individual
个
=
丨
+
人
:
Mnemonic symbol: Neanderthal Man (人). Neanderthal Man (人) needs to use the elevator's bathroom (e4) but it's occupied by Guy Fawkes (g), and there's only space for one individual (个). Impatiently Neanderthal Man knocks on the door using his dinosaur bone (丨).
"person" radical in Chinese characters (Kangxi radical 9)
亻
=
丿
+
丨
:
Mnemonic symbol: Rosa Luxemburg. She's quite radical, and her name starts with "r", just like "ren2". Also, 亻appears at the left-hand side of characters, and Rosa is a leftist as well.
Robinson Crusoe (r) and Rosa Luxemburg (亻) are having their favorite snacks in the encampment's kitchen: Rosa is eating a banana (丿) and Robinson is eating a dinosaur bone (丨).
hard / strong / solid / sure / assuredly / undoubtedly / of course / indeed / admittedly
固
=
古
+
囗
:
Gitta Giraffe is building a hard and solid stronghold inside the bathroom's space station. The stronghold consists of a cloister inside a wooden box.
lit. three monks have no water to drink (idiom) / fig. everybody's business is nobody's business / (If there is one monk, he will fetch water for himself. If there are two, they will fetch water together. But if there are three or more, none will take it upon himself to fetch water.)
the Three Worlds (as proposed by Mao Zedong), i.e. the superpowers (USA and USSR), other wealthy countries (UK, France, Japan etc), and the developing countries of Asia, Africa and Latin America
the Three Represents enunciated by Jiang Zemin 江澤民|江泽民 as the duty of the Chinese Communist party in 2001, namely: to represent productivity of an advanced society, forward progress of advanced culture and the fundamental interests of the people