The Speed Brake Indicator indicates the current position of the external Speed Brake. There's three symbols that tells the pilot if they are closed (Word Close appears), Fully Opened (Series of 9 dots are displayed) or there's no electrical power or may also appear when in transit during switching (a series of Diagonal lines)
The model was created in Blender 2.91 for the Cycles engine, the textures and materials are PBR based. The model has been rigged with a simple Empty for easy animation.
NOTE: The real life indicator has a plexiglass in it to protect the internal mechanism, it is shown on the thumbs as a separate mesh in all viewport renders (solid and material preview). I also tried to keep all the materials packed within the .blend but if for some reason it is not here, you can find them on the Texture folder in the .zip file that accompanies this panel or if you still require it, don't hesitate in contacting me.