za; the stanza is the unit that shapes the poem as a whole.
Symbol. Something that on the surface is its literal self but which also has another meaning or even several meanings. For example, a sword may be a sword and also symbolize justice. A symbol may be said to embody an idea. There are two general types of symbols: universal symbols that embody universally recognizable meanings wherever used, such as light to symbolize knowledge, a skull to symbolize death, etc., and constructed symbols that are given symbolic meaning by the way an author uses them in a literary work, as the white whale becomes a symbol of evil in Moby Dick.