Where did one-letter case names come from?

[rljacob]

Does anyone remember how the one-letter case names (B-case, F-case) came about?

Its in the CESM1.0 docs
https://www2.cesm.ucar.edu/models/cesm1.0/cesm/cesm_doc_1_0_4/x42.html

But I'm pretty sure its older then that.

[klindsay28]

The convention is mentioned in CSM/CCSM 1 documentation.
According to documentation on legacy releases, this version was released in June 1996.
This doesn't describe how the convention came about,
it just demonstrates that it's been around a long time.

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