The suffix “-gram” in mathematics refers to a star polygon. For example pentagram is 5 pointed star.
The way you make a star, in mathematics, is by drawing a number of points evenly spaced around a circle and then connecting each point to the point more than one but less than the number of points/2 away. So for example a pentagram is formed by drawing five points in a circle and connecting each point to the the point 2 in front and behind in sequence. A hexagram is formed the same way but with 6 points. A heptagram is formed with seven points connected either every 2 or 3 points etc.
By this process a tetragram cannot exist because the only options for 4 is 1 or 2 which are equal to 1 and 4/2. Likewise a triagram cannot exist because the only option is 1.
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