There is also a Jet Standard Atmosphere which is ISA made easy for pilots.
Thank you.
What appears to be the case is your manuals gave a name to the rule-of-thumb used by aviators everywhere (who use "feet" at least.) The standard lapse rate is about 2C per thousand feet. Yes, the FAA expects us to know that. ;-) But we don't call it anything.
The usage appears to be idiosyncratic, given the non-appearance in any scientific literature I've seen. And lack of Google hits.
