Consciousness is habit of thought, beneath consciousness is awareness. Consciousness grasps, awareness observes, but in most people these two are fused, so in observing they grasp.
The Buddha invented a simple meditation technique, one that grows in the practitioner, called Vipassana and not dissimilar to Zen. Vipassana directly applies awareness to a subject, and this separates awareness from consciousness, little by little breaking the bonds until one day the practitioner can observe without grasping, and then they are perfectly within the moment, and to be that way they experience the true nature of being human, which for a better word is happiness.
I don't think terminology helps, it is better to consider matters in simple terms.
It is possible to look at a painting without judging it to be good or bad, without thinking any thoughts about the painting, without discussing the painting with a friend, to just look at the painting, know you are looking at it, but not thinking, 'I am looking at it.' This would be not grasping. However, this is a skill that can be achieved early on the road to enlightenment; deep inside will be an expectation or hope that you will become enlightened through your practise and so you will not experience Nirvana, so I guess you could say that you are signless. Keep at it, the ego is dissolved by persistence, not by understanding nor by merit.