Muladhara or root chakra is represented as a yellow square, with 4 red petals (According to Wikipedia).
This is the first chakra known as the root chakra (Muladhara) and is located at the base of the pelvic bone. It relates to our survival instincts,and to our sense of grounding and connection of our bodies to Mother Earth. Ideally this chakra brings us the foundations of health and the development of spirituality by the stimulation of the kundalini (soul energy) (Debbie Creagh).
This chakra relates to the physical functions of the Adrenal Cortex, Hormone Cortisone, Skeletal System, Spine and the balance of Blood Cells including the sex organs such as the prostate and the ovaries, cervix and Reproductive System.
Congestion of this chakra can lead to symptoms such as sluggishness, tiredness, weight problems, skin, bone, teeth and back problems (Lee Wei-Dei).
(Citing Siam Reiki materials)
The First Chakra – The Base Chakra