Sittam,,means what.."exceptional thinking or problem solving skills beyond and above expectations or simply..mind blowing IQ level to stete in modern terms..hence Siddar should appropriately come by the meaning of someone who can have this ability.
The definination that provided by google are as follows:-
Siddha ('Great thinker/wise man', Sanskrit, "perfected one") is a term that is used widely in Indian religions and culture. It means "one who is accomplished". It refers to perfected masters who have achieved a high degree of physical as well as spiritual perfection or enlightenment.
Agreed? Yes :) and not be confused with Rishis( Seers)
Siddars are those who achieved their current condition and status by various means of bhakti plus their own independent research on the areas of their expertise i.e herb identification..alchemy and medicine..astrology and space...and so on..
From exceptional dedication and immovable faith in finding the truth beyond the veils of Maya..these siddars prevailed...and thats why they in most cases people who encountered them describes them as mad or unravelling...they see the world in its true form just like from the movie matrix...
Anyway..here are some interesting things siddars can accomplish:-
1. To become tiny
as the atom within the atom (Anima)
2. To become big in unshakeable proportions (Mahima)
3. To become as light as vapour in levitation (Laghima)
4. To become as heavy as the mountain (Garima)
5. To enter into other bodies in transmigration (Prapti)
6. To be in all things, omni-pervasive (Prakamya))
7. To be lord of all creation in omnipotence (Isatvam)
8. To be everywhere in omnipresence (Vasitvam)
-Thirumandiram
2. To become big in unshakeable proportions (Mahima)
3. To become as light as vapour in levitation (Laghima)
4. To become as heavy as the mountain (Garima)
5. To enter into other bodies in transmigration (Prapti)
6. To be in all things, omni-pervasive (Prakamya))
7. To be lord of all creation in omnipotence (Isatvam)
8. To be everywhere in omnipresence (Vasitvam)
-Thirumandiram
1. Being
undisturbed by hunger, thirst, and other bodily appetites
2. Hearing things far away
3. Seeing things far away
4. Moving the body wherever thought goes (teleportation/astral projection)
5. Assuming any form desired
6. Entering the bodies of others
7. Dying when one desires
8. Witnessing and participating in the past times of the gods
9. Perfect accomplishment of one's determination
10. Orders or commands being unimpeded
2. Hearing things far away
3. Seeing things far away
4. Moving the body wherever thought goes (teleportation/astral projection)
5. Assuming any form desired
6. Entering the bodies of others
7. Dying when one desires
8. Witnessing and participating in the past times of the gods
9. Perfect accomplishment of one's determination
10. Orders or commands being unimpeded
Cool huh?
SDT