Hi BobBee, a sticky board is a white flat thin object placed usually under a screened bottom board. These sticky boards are thin plastic sheets with adhesive that causes objects like varroa to stick.
Now you probably know this so excuse my description. Mr. Robo is so experience the fella thinks beeks know the terminology. Mr. Robo is a seasoned veteran beek, administrator he is. Mr. BobBee, you may well understand, you certainly know the mites washes so again, excuse my explanation as I do not know your experience base.
Cheers