Part identification: 2x1 tile, but with only one centered stud on top

mibieri

I have no idea how this part is actually called. It's just a 2x1 tile, but it has just one stud on top which is centered.

I think it's a quite often used tile, but I could not find it.

Aladine

search plate 1x2 or jumper

BrickItOn

The first or second from these probably. Just like tiles they come with, and without groove.
http://www.brickowl.com/search/catalog?query=3794

Teup

Don't forget this one

http://www.brickowl.com/catalog/lego-plate-1-x-2-with-1-stud-with-groove-and-bottom-stud-holder-15573