There is a type of screw/ bolt that is flat on top so that it's almost flush when fully seated, but it is not counter-sunk, and it usually takes a hex driver (allen key). I see it used on Ikea furniture frequently, and the only pic I could find of it was from an Ikea manual:
Note that it is not counter-sunk so from the side it looks like a 'T'.
Does anyone know what the correct mech eng jargon term for this screw would be? E.g. if I'm telling someone to switch from a pan-head to this type of screw?