Six*

Six is a unitary perfect number, a harmonic divisor number and a highly composite number. The next highly composite number is 12.

The evolution of our modern glyph for 6 appears rather simple when compared with that for the other numerals. Our modern 6 can be traced back to the Brahmins of India, who wrote it in one stroke like a cursive lowercase e rotated 90 degrees clockwise. Gradually, the upper part of the stroke (above the central squiggle) became more curved, while the lower part of the stroke (below the central squiggle) became straighter. The Ghubar Arabs dropped the part of the stroke below the squiggle. From there, the European evolution to our modern 6 was very straightforward, aside from a flirtation with a glyph that looked more like an uppercase G.^[3]

Retired number of former baseball players Stan Musial, Tony Lazzeri, Al Kaline, Tony Oliva and Steve Garvey.

*-Thank you, Wikipedia.

This #6 tried to retire:
6 dies insquequo Oris Dies!