Here is how Shiffrin explained it in an interview with NBC Olympics before Sochi:
"I have the acronym A.B.F.T.T.B. on my helmet. I used to make people try to guess what it means, but it stands for 'Always Be Faster Than The Boys.' [Three-time U.S. Winter Olympian] Heidi Voelker signed a poster for me when I was really little and she wrote that. She said, 'Dream big, Mikaela, and always be faster than the boys.' I always saw that poster in our basement — our basement was like the playroom — and would be like, 'Always be faster than the boys. OK, Heidi, I will.'
My dad was like, 'You should write that on your skis.' And so we started to do that. Now I have somebody doing my skis for me and they are very particular about what they write on my skis, so they won't let me write that on them. But I can paint my helmet with the words on it. It’s just inspiring. At this point it's almost more of a ritual or just something that’s sentimental for me.