What is this very short power cable called?

I have a couple of networking components in my rack that take giant AC adapters ("power bricks") that don't fit neatly into my rackmount PDU.

I have one "thingy" that is shown below, and I need to buy a few more. But I have no idea what I'm searching for because I don't know what the "thingy" is called.

Yes, this drawing is terrible. I would ask my 4-year-old to draw it for me because she's a better artist, but she's taking a nap.

Solution 1:

I would just call it a "very short extension cord", and in fact a Google search for "short extension cord" turns up lots of results of exactly what you're looking for. E.g., these, which have a pass-through plug.

Solution 2:

"pigtail" is a common term for these (actually any 6" to 1' power cord) in the datacenter environments I've worked in.

Solution 3:

You can also get short Y power cords.

These cables (including the single variety) are sometimes called "outlet savers".

I also love the 90° rotating plug variety for some applications. The cord goes flat against a wall.