I'm a repeat offender of asking "Name that thing" questions. The most recent one is here (now deleted).
Where can I ask this kind of question if not here?
I strongly feel that well formed questions of this format, with clear criteria should be permitted here. The reason is that it can be very helpful for people like myself and future googlers who may be unwittingly starting to work on an area that others have already worked on, but without sharing the right terminology it is harder to connect. It is good for programmers if they know the names of objects as they appear in the "literature" so to speak.