The wind at one's back — and the utility-class styling system this house's interfaces wear.
Old English tægl (a tail) with wind, from Proto-Germanic *windaz; a tailwind is, literally, the wind blowing from behind, and the styling framework borrowed the plain image of a push from behind.
The wind at one's back, and the utility-class styling system this house's interfaces wear. Both carry the same image of an unseen push helping something move forward.