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CADS is an unfortunate acronym "cad" in british english is like "douche" in american english.
Lastly there is "Bicender", which could also qualify, although to me that sounds a little like ac/dc, w
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I have the same impression when I start seeing Bi and Trans with the current popular sexual persuasions, not that there is anything wrong with that

Acronyms are popular because they make things easy to remember and the same acronym is ofter used in different trades but with different meanings but again it makes it easy to remember and spreads the concept quickly.
Don't know about the British use of CAD but it also is used in engineering circles as Computer-Assisted Display System and probably in many other trades as something different but all this leads to the ease of remembering and spreading the concept.
Access........can imply both ascent into the canopy and movement within the entire canopy in other words access to the entire canopy.
Canopy work.......can imply much more than working on a tree, it encompasses everything one might do in the canopy, environmental studies, research, hunting, surveillance, recreation and of course tree work.
I think the thought that this is all tree work severely limits what all this rope climbing can be about and narrows the populace perspective of this exhilarating, physical and almost spiritual activity.
The more I read this, the more I like
Canopy Access and Descent System.........but of course that is just me in my unbiased opinion.
I like the idea of coming up with something specific for concept of tree access and think it is about time it stands on it's own.
Being new to the ROPE climbing activity, I perhaps see it from a little different view then some. (I had to add ROPE, because access to the canopy for me started 50 years ago.
Ok, I'm done and back to working on learning to sew eyes.