mu

But the next star below μ, marked Zeta (ζ), is even more beautiful.

Turn your glass upon the star shown in the map just above Mu (μ) and Epsilon (ε).

Beta (β), or Mirach, with the smaller stars Mu (μ) and Nu (ν), form the girdle.

Spore oval, large (14 μ by 5.5 μ), with a single very large polar-capsule.

He found that 0.8 μ was the mean of the probable errors of the seven bases measured by him.