Is sumerian writing called hierglyphics

The second civilization to develop writing, shortly after the Sumerians, is Egypt. The Egyptian characters are much more directly pictorial in kind than the Sumerian, but the system of suggesting objects and concepts is similar. The Egyptian characters are called hieroglyphs by the Greeks in about 500 BC, because by that time this form of writing is reserved for holy texts; hieros and glypho mean 'sacred' and 'engrave' in Greek.