Karmandir 
About
The Hanuman Yantra is a yantra of Hanuman ji, the devoted servant of Shri Ram, loved for his strength, courage and humility. In its common form, a circle holds two curved lines that set apart a narrow part on its left and on its right. Eight lotus petals surround the circle, and a square frame with four gates encloses it all. The numbers 1 to 10 are written on it, and the centre carries a twelve-syllable mantra of Hanuman ji found in the Narada Purana. Many families keep it in the puja place and sit before it on Tuesdays and Saturdays to remember Hanuman ji.
Parts of the yantra
Bhupura: the outer square of three lines with a gate on each side, the edge of the sacred space. Eight petals: a lotus around the circle with one petal pointing straight up; the petals carry the numbers 3 to 10, with 3 on the bottom petal, then going round by the left so that 7 is at the top and 10 at the lower right. Circle: the main space of the yantra. Two side parts: inside the circle, two curved lines bowing toward the centre set apart a part on the right (number 1) and on the left (number 2). Centre: the mantra ॐ हं हनुमते रुद्रात्मकाय हुं फट्. In the Narada Purana, हं is the seed (beej) of this mantra, 'Rudratmakaya' honours Hanuman ji as a form of Rudra (Shiv), and हुं फट् are the traditional syllables of armour (kavach) and weapon (astra). The same text describes its worship on an eight-petal lotus, with the mantra in the middle and Sugriv, Lakshman, Angad, Nal, Neel, Jambavan, Kumud and Kesari honoured on the petals.
How to use it
Keep the yantra upright as drawn, with the petal marked 7 at the top, on a clean cloth in the puja place. Light a diya, offer a red flower and, if you like, a little sindoor, with gud-chana as bhog, as is usual for Hanuman ji. Sit facing it, rest your gaze on the centre, then let it move slowly over the petals to the gates and back to the centre. Chant ॐ हनुमते नमः 11 or 108 times, or read the Hanuman Chalisa. Many devotees do this on Tuesdays and Saturdays. The twelve-syllable mantra written in the centre belongs to a fuller tantric practice that is learnt from a guru.
ॐ हनुमते नमः
Om Hanumate Namah →
Some plates leave out ॐ at the centre and write the mantra as हं हनुमते रुद्रात्मकाय हुं फट्; the Narada Purana counts its twelve syllables from हं. The number of lines in the outer square also differs from plate to plate: two in the printed drawing, more on metal plates.
