絲線

丝 = 幺 + 一 : Socrates locked himself out of the space station! To call the other astronauts for help, he attaches some silk cloth to a flute and waves it like a flag.

线 = 戋 + 纟 : Mnemonic symbol: barbed wire.

线 = 戋 + 纟 : The silk worm wants to use the floating tank in the anthill's bathroom, but there's already Marie Curie inside—and she secured the tank by setting up barbed wire all around it.