二

er

two; 2

Two lines are stroked horizontally to signify number two.

五

wu

five; 5

The two horizontal lines (二) signifying heaven and earth is inter-connected (symbol) to represent the universe. It was believed that the universe contained five basic elements.

吾

wu

I; my

Classical idioms: 吾辈 (we/our generation); 吾国 our nation

Signifies an act of wishing (口) for well-being of myself (I) to the god of nature who governs the five (五) basic elements of nature

语

yu

language, speech

与人语 to speak with someone; 

一言一语 every single word (lit. one speech, one language)

the words (讠) in my (吾) own language