Hey, sorry for the confusion! This is what I said:
I did not say that "the symbol of EMS is the Rod of Asclepius". It is a part of the symbol of EMS.
Here's an explanation of the Star of Life from
EMS.gov for the curious, and the Rod of Asclepius' part on it.
Having been in EMS for about a decade, I have had some exposure to EMS insignia so have a professional interest in addition to personal interest.
I feel pretty confident with my facts.
In terms of standardization (to address the second part of my quote), here is
NREMT.org, where you can see some examples of the Star of Life with the Rod of Asclepius on it, and in the "store" section you can see how the Rod of Asclepius is standardized on uniform patches Nationally Registered providers wear - if you're wearing a NR patch, this is your option for patches - there are no variations in current NR patches (and "previous edition"/classic patches are sometimes collected by people in EMS for fun). The Rod of Asclepius is not standardized on ambulances themselves, and there isn't a lot of standardization on patches between smaller/local/state services.
If my previous post came across as a lecture, that was not my intention. This is something that I've enjoyed learning about, and thought others might enjoy too, especially in the context of wearable symbols. If you have any further issue with my facts, I'd be happy to take it up by PM.
As I said above, jokingly: additional resources are available on request -- but I am happy to really provide them!
Otherwise: Medical Snakes are cool! I hope someone finds more cool in-stock pins, because I'd like one too.