1 2 —*— 3 7

It looks like you have an expression involving numbers. However, it's unclear what operation or relationship you're trying to convey. If you're expressing a mathematical operation, it could be interpreted as:

\[ \frac{1 \cdot 2}{3 \cdot 7} \]

Or if you're indicating a multiplication of numbers, it might be something else.

Could you please clarify what you need assistance with regarding these numbers? Are you looking for a calculation, simplification, or something else?