The use of a single ampersand is older than symbolic parameters; see, e.g., 
<http://bitsavers.org/pdf/ibm/360/os/R01-08/C28-6539-4_OS_JCL_Mar67.pdf#page=23>

________________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of Sri 
h Kolusu <[email protected]>
Sent: Wednesday, July 5, 2023 5:53 PM
To: [email protected]
Subject: Re: Double ampersand?

>> Are they making a special case out of something that isn't a special case?

Gil,

Not really

https://www.mail-archive.com/[email protected]/msg80064.html

Thanks,
Kolusu

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