I imagine that would be a hairpin which takes the shape of a U. In routing there is a hairpin NAT which redirects traffic exiting back into the local network.
Confusingly enough, in Italy I believe it is not quite a thing "elbow pasta". Personally I have never heard anyone refer to any kind of pasta as "gomiti", though Google showed me that they indeed exist. I have always heard the ones that looks like elbows in other names.
In Chinese doing an u-turn can be called 掉头 or 调头, literal translation would be lose head (or front) or change head (front). For whatever reason apparently both can be used.
The name U turn itself is dumb anyways (alongside shit like T-shirt, I kid you not I tought my english teacher was trolling us because I refused to believe at 12 that people in any part of the world use a '-' in a regular word they use everyday).