This is the Kanji, a characterized Chinese-Japanese written language, for loyalty. In which Travis is loyal to all of his family, even when he believes their thoughts and decisions is not what he would prefer.
Instantly when I saw this image, I thought of youth. As it personifies in my perspective to the book, showing that Travis is this character in the book where he is really the only child that is going into maturity facing with life. Which brought me to the Greek Mythology of Baucis and Philemon.
Sweden has historically really have been a neutral country when it comes to war. I believe that Travis is like Sweden, because he is always in the middle of arguments and conversations. In which Travis does not really know what is going on during those arguments, kind of like Sweden.