This is designed to be a simple set of questions and answers - please no general chit chat in here - keep it focused to help new users!
Well, as they say, GIYF, Wikipedia shows it to mean "Uncommitted Gate Array" or in other words, an IC with a bunch of logic gates that can be configured by connecting (or disconnecting) paths between the various gates such as PALs (Programmable Array Logic).
Anyway here is the link:
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With these, all the semiconductor structures are already designed and defined by the chip manufacturer. But the final top metal interconnect layer can be designed by the customer (meaning the industrial buyer, that is for example, Sinclair) to suit their application. The chip manufacturer then adds this custom metal interconnect layer making the chip a semi-custom design.