Hacking a site with wddl, CAEj and LsBb?

Question

On occasion our site will get hit with what looks like a series of attempted attacks. The comments on our blog posts will look like this:

"wddL" - 5057 said on Friday, March 4th at 10:42pm MST
"wddL" - ppGV,(),,,'(", said on Friday, March 4th at 10:42pm MST
"CAEj" - zOGH said on Friday, March 4th at 10:40pm MST
"CAEj" - zOGH said on Friday, March 4th at 10:40pm MST
"CAEj" - zOGH..)'.",)), said on Friday, March 4th at 10:40pm MST
"CAEj" - zOGH (,'.").),)() said on Friday, March 4th at 10:40pm MST
"CAEj" - zOGH ('NHgUTS<'">raLnrY) said on Friday, March 4th at 10:40pm MST
"CAEj,,).)')"(," - zOGH said on Friday, March 4th at 10:40pm MST
"CAEj'EHOtrR" - zOGH said on Friday, March 4th at 10:41pm MST
"CAEj" - zOGH said on Friday, March 4th at 10:41pm MST
"CAEj" - zOGH said on Friday, March 4th at 10:41pm MST
"LsBb" - iqfV,).)",'.,) on Friday, March 4th at 10:40pm MST
"LsBb" - 7635 on Friday, March 4th at 10:40pm MST

I'm just trying to understand what they're attempting, but I'm not familiar with the commands they're trying.

I think they're trying to talk to the hardware in our server?

My best efforts to learn on my own what "wddl", "CAEj" and "LsBb" are:

wddl = "Wave Dynamic Differential Logic"
CAEj = "Some kind or "R" argument?"
LsBb = "Something to do with assembly language programming?"

Can anyone tell me what it is they're attempting?