In many communities married women are expected to sport a kumkum mark on their forehead at all times. In many parts of North India the tilak is a respectful form of welcome, to honour guests or whilst bidding farewell to a son about to embark on a journey or going to war. The tilak covers the spot between the eyebrows, which is the seat of memory and think also known as Aajna Chakra in Yoga. The tilak invokes a feeling of sanctity in the wearer and is a blessing of the Lord and a protector against wrong tendencies and forces.

The entire body emanates energy in the form of electromagnetic waves - the forehead and the subtle spot between the eyebrows more so. That is why worry generates heat and causes a headache. The tilak cools the forehead, protects us and prevents energy loss. (In Indian Culture Why do we by Swamini Vimalananda & Radhika Krishnakumar).

The bindu can be interpreted as 'zero' 'or 'decimal'.
Indian 'Mathematicians' were not mathematicians in the general sense of the term as meant by Western mathematicians. The Indian mathematicians were in reality Yogic seers, Mystics, people who understood the nature of the universe far beyond what the rest of the world could comprehend. These amazing people were able to express most of the structure of the universe and creation in the language of math.

The concept of Zero, also called shunya is not just a mathematical concept, but originated as a spiritual explanation of the nature of the universe in Hinduism.

The shunya, or shunyatam (in Tamil philosophy) or Zero in English was propounded by them as the starting point and the ending point, the true nature of everything in this universe. That emptiness from which everything emerged and into which everything will collapse in unending cycles. That emptiness which is the true nature of all objects, the object itself being illusion or maya.

In addition to zero they came up with another concept called the decimal or the bindu without which again no math in this universe will exist.

Reason three are excerpts from an article by Sanjay Rao 'Indian Math developed to describe God and the Universe'.

Remove the kumkum and what is left is a round ball that resembles the sun. Called Surya in Hindi, the sun gives us light, energy and vitality. It selflessly and equally helps all beings on Mother Earth without asking for anything in return. At eSamskriti we strive to imbibe the qualities of Surya.