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The Ancient Egyptian Sun hieroglyph is Gardiner sign listed no. N5 for the sun-disc; it is also one of the hieroglyphs that refers to the god Ra.
In the 24th century BC Palermo Stone, the sun hieroglyph is used on the Palermo Piece-(obverse) of the 7-piece Palermo Stone to identify dates, or specific "day-events", ..."day of ...." A few of the King Year-Register's are dates only for example in Row V (of VI rows):
Luwian hieroglyhs, Sa-sub4
The Luwian language hieroglyphs, Luwian hieroglyphs has 7 varieties for the syllable of 's' and 'a'. For 'sa' number 4 (Sa4), the same hieroglyph in both Egyptian and Luwian languages exist; it is Sa-sub4 (Luwian hieroglyph).
References
Sun (hieroglyph) Wikipedia(Text) CC BY-SA