Jumper plate (or jumper brick) is the common term for Plate 1 x 2 with 1 Stud and Plate 2 x 2 with 1 Stud. While listed by LEGO as a variation of a plate to many fans it is seen as a variation of a tile.washing machine brick) was invented by modelbuilders at one of the model shops. Legend further has it that the name comes from the ability to "jump" over a half 'stud' alignment, something very useful for detail work in many different themes and building styles.
Note that 10115-1 from 2001 is called "Jumper Bricks", although it contains no bricks, only this part. It is not clear if that was an homage by LEGO to the legend or an acknowledgement of the truth of it.
The part is also known as a "half-stud", for the change in alignment (sometimes called a 'half stud offset') it produces. The larger size introduced in 2009 allows for the half-stud offset in two dimensions creating more opportunities and challenges for builders.
New Version (2014)
In 2014 a new version of this element began to appear in setsnew . The new mold changed the underside of the jumper from a solid rod to four small tabs as shown in the photograph below.
- new - Minor changes in latest 21050 – Architecture Studio set - accessed September 9, 2020.