The cuneiform sign by itself was originally an ideogram for the Sumerian word "an" ("sky" or "heaven"); its use was then extended to a logogram for the word "diĝir" ("god" or "goddess") and the supreme deity of the Sumerian pantheon "An", and a phonogram for the syllable . Akkadian took over all these uses and added to them a logographic reading for the native "ilum" and from that a syllabic reading of . In Hittite orthography, the syllabic value of the sign was again only "an".