工
=
二
+
丨
:
Mnemonic symbol: a steel beam, since 工 looks like the cross section of a steel beam. In front of the engine ((e)ng1), Gitta Giraffe (gu) is doing some hard work: She's stacking a capacitor (二) on a dinosaur bone (丨) on a capacitor (二). She's not very successful, but then she gets the idea to use steel beams (工) as support.
签
=
⺮
+
佥
:
The Queen of Hearts (qi) and General Fu Qian (佥) reached an agreement in front of the anthill (an1). To finalize it they sign (签) their names in the sand using a bamboo stick (⺮).