parallel, and vertical lines represent two complete
entities. An example is , the sign of
Gemini, and the Latin numeral for 2.
In geometry this sign can mean parallel with.
In the US system of hobo signs stands for here you can get whatever you want, they will give you all you ask for.
In prosody it is the caesura. This sign is also the fifth in series of the reference marks, called parallel. See the pilcrow sign in Group 54 for more such signs.