I found this in the Introduction section of the JES2 Init & Tuning Reference:

Table 1. Initialization Parameter Character Specifications and Their Meanings
Character Meaning
a Alphabetic (A-Z)
c All EBCDIC characters (except ,()-=)
n Numeric (0-9)
m Numeric (0-9)
h Hexadecimal (0-9 and A-F)
j Alphabetic (A-Z) and the special characters ($, #, @)
v Alphabetic (A-Z) and numeric (0-9)
x Alphabetic (A-Z), numeric (0-9), and the special characters ($, #, @


On Tue, 1 Mar 2022 08:38:37 -0800, Tom Brennan <t...@tombrennansoftware.com> 
wrote:

>I was thinking j might mean alpha and national, and c might mean alpha,
>national, or numeric.
>
>On 3/1/2022 2:51 AM, Seymour J Metz wrote:
>> Neither the J nor the Cs have any significance; jccccccc is just a variable 
>> name , as is nn. I probably would have used the name ddname, but that's only 
>> six characters.
>>

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