Bell-end - Silver acrylic-haired builder. Usually on holiday. Wears woolen jumpers. Usually seen on threads bemoaning stylus removal through snagging on aforementioned woolen wear.
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Now now tradesmen, play nicely or somebody’s bucket will get abused !
Ooh! Get you love… just cos you couldn’t work your computer 
I never knew that. I always thought the transom was the top bit of a window. You live and learn it seems.
The ‘top’ member of a window is the head.
As well as lights above doors, transoms are also horizontal dividing timbers on windows.
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And vertical ones are mullions.
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Window nazi’s.
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Nein
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All of the Architects I’ve worked for called them lights, not windows.
The transom is the back end of a boat, the bit that connects the two sides.
(pointless using any proper nautical terminology on here )
or architectural, it would seem
Fenestration 
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Yeah, but that’s more the collective term for a number of windows (or doors, in fact)
The old school architects I worked for always called a window a light.
Ok, technically each individual panel of a window is a light, but they still used that term to describe any window… I’m going back 35 years + and they were all near retirement age then, but they knew their stuff.
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Probably a geographical thing, around here they are generally referred to as casements.
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Maybe it is regional, but a casement is only one particular type of window.
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Yes, it used to be casements or sashes, but not too many sashes fitted nowadays.
The sash windows I’ve seen that have been made recently to fit in with a particular period of a building are absolute shite. They couldn’t make real ones anymore, too expensive and not many joiners would have the skills anyway.
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transom
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That’s windowang 
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