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Looking at different motherboards one can notice that they can be distinguished by some of these terms: ATX, mATX etc. This pretends to the size of the motherboard. My question is what are the motherboards that can hold 2 CPUs called in technical jargon?

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I don't think there really is one.

Dual Socket or Multi-Socket is a description rather than a specific term. With multi-core being the norm multi-socket motherboards have become something only used in servers (and a few very expensive workstations that are really servers in a more user friendly case and the ability to add graphics cards1. Today entry level servers are losing their multiple sockets—one CPU being enough for basic workloads.

Even before multi-core, even dual-socket motherboards were a high end and and specialist and never entered the mainstream2

1 However this is also becoming the norm for servers with dedicated GPU accelerators being added to servers for HPC usage.

2 And I certainly include the workstation box now mostly retired sitting here, powered down, retained just in case I need anything on it.

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WTX is a form factor term I was looking for. Yes it is mostly used on servers.

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All the generic rackmount server cases I have seen are for EATX motherboards, and Wikipedia says that WTX is has long been discontinued. en.wikipedia.org/wiki/WTX_%28form_factor%29 – paradroid May 6 '11 at 23:42
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