 Besides 'black', the alternate use of the hieroglyph is for items terminating, coming-to-an-end, items of completion, hence a reference to charcoal, burning to its ending.Ancient Egypt is commonly referred to as 'km.t' , believed to be a reference to the black Nile Delta earth.The determinative O49 O49 is used to designate the term for 'country, inhabited/cultivated land', called the niw.t (a political designate).