Is this receptacle rated for aluminum?

The main floor of the house is wired with aluminum and the base with copper. I pulled a receptacle to check the rating and found that it had CU andf AL but the AL is crossed out like a no smoking sign. Does this mean it is not rated or is it just a piece of plastic left over from the manufacture. We do not see much aluminum here so I am not up on all of it.
Thanks for the help.

I think this is for Copper only…

That is what I am thinking as well Roy. Just thought a few of the guru’s who had seen these may have a different idea.

Not rated for aluminum.

Thank you for comfirming Robert.

Universal symbol for NO.

Same symbol meaning as a traffic sign with the slash. No, in this case AL.

I guess that confirms it then. Thank you for your help.