In Python or Pandas what does "Vern" or "Prior Vern" mean?

I am coding in Python and Pandas. What does the term "Vern" or "Prior Vern" mean?

Operation 0.11.0 (ms) Prior Vern (ms) Ratio to Prior

df1 > df2 13.32 125.35 0.1063

df1 * df2 21.71 36.63 0.5928

df1 + df2 22.04 36.50 0.6039

Operation	0.11.0 (ms)	Prior Vern (ms)	Ratio to Prior
`df1 > df2`	13.32	125.35	0.1063
`df1 * df2`	21.71	36.63	0.5928
`df1 + df2`	22.04	36.50	0.6039

Source http://pandas.pydata.org/pandas-docs/stable/basics.html [Editor's note: This term is no longer present in the docs. The last version it appeared in was v0.13.0.]

Solution

Looking at the context, "vern" means "version," and that 0.11.0 refers to a Pandas version. It's talking about the performance impact from one version of numexpr to another.