[FOM] Notations in set theory

[H. Enderton]

As I understand it, the use of V for the universal class stems from
the use of Lambda for the nullset.  So an inverted Lambda (V) names
the complement of the nullset.

Can anyone verify this, with supporting references?

--Herb Enderton

On Fri, 10 Oct 2008, pax0 at seznam.cz wrote:
> Set theory has many names whose origin is not well known,
> such as V and L for two most important classes, square and diamond principles,
> ....