(prefix indicating ordinal number, e.g. first, number two etc) / order / (old) rank in the imperial examinations / mansion / (literary) but / just
第
=
⺮
+
弓
+
丨
+
丿
:
Dorothy Gale (di) accomplished an awesome result with her composite bow (弓) in the space station's bathroom (Ø4): She shot a bamboo stick (⺮) into a banana (丿) so it was split in half, and then fired a dinosaur bone (丨) into the bamboo stick (⺮) so it was split in half as well. Dorothy is number one (第) with the bow!
(prefix indicating ordinal number, as in 第六[di4 liu4] "sixth") / (literary) grades in which successful candidates in the imperial examinations were placed / (old) residence of a high official / (literary) but; however / (literary) only; just
二
=
一
:
Mnemonic symbol: a capacitor, because the two strokes remind me of the symbol in electrical drawings. Albert Einstein (Ø) is experimenting with a capacitor (二) in the space station's bathroom (Ø4). He finds that it's uncomfortable to discharge a capacitor using two flutes (一).
(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).
人
=
丿
+
㇏
:
Mnemonic symbol: Neanderthal Man (人). Robinson Crusoe (r-) is looking for snacks in the encampment's kitchen (-en2) when he suddenly spots Neanderthal Man (人). Neanderthal Man offers him a banana (丿), but Robinson Crusoe doesn't trust the present and pokes it with a finger (㇏).