The bindu is often closely related to male sperm. The reason is not difficult to understand: from one drop of sperm, the tiniest bindu combined with the ova of the female grows life in the form of a baby. The bindu point of sperm is the starting point for creation. This is symbolic of the more subtle bindu which makes manifest all objects from the underlying substratum. In fact, it is almost a perfect symbol which makes understanding of the bindu a little easier. Because the bindu is widely associated with male sperm, many tantric charts of the human centres show the bindu in man, but omit it in women. That is, the bindu trigger point is clearly depicted at the back of the male head. This symbolism only applies when bindu is intended to indicate sperm. In actual fact, both men and women have a bindu, a subtle bindu that is, for without bindu they could not exist. In kriya yoga sadhana, both men and women should concentrate on the bindu trigger point at the back of the head.
In other symbolic systems the bindu is comprised of two other bindus, one red and one white. In the Chudamani Upanishad it is written: “The bindu is of two types, white and red. The white is shukla (sperm) and the red is maharaja (menses).” (v. 60)
This white bindu symbolizes Shiva, purusha or consciousness. The red bindu symbolizes Shakti, prakriti, the power of manifestation of all objects. The trigger point for bindu is at the back of the head; this is the centre that is used in kriya yoga. The seat of the red bindu is the mooladbara chakra. The purpose of yoga, tantra and all other spiritual systems is to unite these principles, so that Shiva (male) and Shakti (female) become one. The text continues: “The red bindu is established in the sun; the white bindu in the moon. Their union is very difficult.” (v. 61)
Though difficult, their union is the whole purpose of yoga. Here the sun represents pingala and the moon represents ida1. These two bindus also symbolize the merging of opposites in terms of male and female. The dynamic prana (female) merges with the static consciousness (male). The result of this union is the seed of the bindu from which manifestation begins, including life. In all spiritual practices, this union results in the ascent of the kundalini: “When the red bindu (Shakti) moves upwards (the ascent of the kundalini) by control of prana, it mixes with the white bindu (Shiva) and one becomes divine.” (v. 63)