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In Egyptian hieroglyphs, the hieroglyph is used for the phonetic value of sma, (a triliteral) with meanings of to join together, to unite with.
Palermo Stone usage
The Palermo Stone (also named: Royal Annals of the Old Kingdom of Ancient Egypt, of the previous ~700 years), scribed circa 2392 BC to 2280 BC, has two uses of the union symbol hieroglyph on the Palermo piece-(obverse) of the 7—piece Palermo Stone (one of the two large pieces). Both uses are for the symbol "ligatured" (tied) to the sedge hieroglyph and the papyrus clump hieroglyph, forming "one large symbol".
The symbols as seen in Row V: (1-vertical Year-register)
(The symbols are read in the "Gardiner font" left-to-right; the Palermo Stone is scribed opposite: right-to-left.)
References
Union symbol (hieroglyph) Wikipedia(Text) CC BY-SA