This is a non-LEGO piece since none of the LEGO parts have gaps as seen in second picture.
One thing to note. Actual LEGO elements (depends on the version of Technic, Axle Connector 2 x 3 with Ball Socket) tend to crack right where the gap is on this clone element.
A few lab examples that have used my parts, mainly 80s/90s Technic:
A quick spincoater made of Technic for use with microscope slides. ("We need a small spincoater. Tomorrow.")
A syringe pusher using pneumatic Technic. Unlike pushing by hand the syringe didn't move under the microscope when squeezed.
Both these two were for a research project; ...
Just got off the phone with LEGO. The official answer to this missing piece is as follows:
Design ID#: 80405
Element ID#: 4251812
The official name, according to LEGO, is:
Roof Tile 2x2/45deg, Control Panel
This information was confirmed by set number 10151 and a photo of the piece(same photo posted here).
While I cannot say you will find this piece with the ...
This is Slope 45° 2 x 2 with 3 Gauges and 3 Knobs
Note that this part was last used in a set in 2004, so it may not have a known element ID. The instructions for that set do not include a part list with element IDs, and the replacement parts listing on LEGO.com for that set does not include this element.