1.08 by 1.08 inches square as per instructions, with baille;
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Sanskrit numerals form the magic square associated with the holy planet Jupiter and the holy number three.

There are yantras for the Sun, Moon, and Venus as well. All other grahas ("planets" in Jyotish or Vedic astrology) are also available by request.
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These are available in many varieties of silver and gold, including very inexpensive plated versions.

For more information, see the book Numerology by Harish Johari.  Here, here, and here are some more sites worth reading.

A Let's Wing It Production.

Organic Oats
Organic Soy Flour
Organic Coconut Flour
Organic Yogurt
Organic Sugar
Baking Yeast
Ghee or Oil
Organic Vanilla and/or Almond Extract (optional)
Organic Raisins (optional)
Organic Almond Slices (optional)
Egg (optional)

Mix about 1 cup each of the flours. Then include about 2 1/2 tbsp of yeast (if you are at altitude - less, I think, if you are not). Add about 1 cup of yogurt, 1 - 2 tbsp ghee or oil, and the 1 egg if you are doing that, along with about 1 tbsp of the extract(s). Mix in about 1/4 cup of the sugar and raisins and/or almond slices each. Knead using your favorite method, by hand or in a bread maker.

Add water if it is too dry and extra flour of your favorite type if it is too wet. Making some previous loaves is probably the best way to know if either of those are happening.

Bake at least 1 hour and 15 minutes on light setting in the bread maker if that is what you are using. If you are using an oven, use the equivalent temperature. Godspeed in trying to find out what that is. (I think it might be around 350-375 Fahrenheit.) If you are going this route, keep an eye out for done-ness as soon as 45 minutes in.

Let substantially cool before slicing.