Keyboard trays or sometimes call keyboard platforms they are the surfaces that attach to an articulatingkeyboard arm. Some are continuous surfaces that hold keyboards with an area to support mouse, they are a component to a keyboard system
Ergostoreonline (A Division of Ergonomic Resources), Ergonomics Dictionary and Glossary North Carolina, USA 2014. http://www.ergostoreonline.com/ergonomics-dictiona ry.aspx, (Ergo - Amer) {744}