There is a famous anecdote about Barry Mazur coming up with the worst notation possible at a seminar talk in order to annoy Serge Lang. Mazur defined $\Xi$ to be a complex number and considered the quotient of the conjugate of $\Xi$ and $\Xi$: $\frac{\overline{\Xi}}{\Xi}$. $\frac{\overline{\Xi}}{\Xi}.$$This looks even better on a blackboard since$\Xi$is drawn as three horizonal lines. 1 [made Community Wiki] There is a famous anecdote about Barry Mazur coming up with the worst notation possible at a seminar talk in order to annoy Serge Lang. Mazur defined$\Xi$to be a complex number and considered the quotient of the conjugate of$\Xi$and$\Xi$:$\frac{\overline{\Xi}}{\Xi}$. This looks even better on a blackboard since$\Xi\$ is drawn as three horizonal lines.