Lvbo Yi (ぃろはは, or colored leaf) is a method of arranging Japanese pseudonyms in order. Because the content has substantial meaning, it can be regarded as a kind of all-letter sentence. It comes from heian period's "Song of the Irubo" (794–1179). This poem was first seen in 179. "ぃろは" is the first three sounds of the poem.
"ぃろは" is roughly equivalent to "ABC" in English, which means the most basic meaning.