|View static image|
|Number of cells||2|
|Year of discovery||Unknown|
The duoplet is a two-cell pattern, one of two 2-cell polyplets (the other one being the domino). It is occasionally seen as a spark, and is periodically produced by certain oscillators such as 41P7.2 (incapable of reflecting gliders) and 34P14 shuttle (capable of reflecting gliders).
It can reflect a glider by 90 degrees, as shown in the infobox.
In other rules
In rules without B0, B1 or B2, and with S1, it is a still life.