Rahu has the element of suddenness. Its help comes in suddenly, like for say, if you are driving or going somewhere and suddenly you get a shock or push, and at the same time, you are saved. What happens suddenly and this sudden help is Rahu. Rahu represents various things, the body is represented by Ketu, the neck by Jupiter, and the head is represented by Rahu. All the lower body clothing items such as pants, etc are represented by Rahu. Rahu also represents stubbornness in the way it sets out to accomplish things.

Like if we see, in the spiritual world the devotion to Rama and Krishna and all of the meditation paths are of Ketu but speaking of the stubborn path like Austerity (hath yoga) or the Aghori Sadhu, the people who practice ‘hath yoga’ and want to achieve things through it. This stubborn path, all comes under the provision of Rahu. In addition to that, sudden and small thoughts also represent Rahu. Studying all year for an exam is Ketu, but the examination paper is represented by Rahu.