This chert Trihedral arrowhead is from Mleiha, Sharjah, United Arab Emirates.  The arrowhead dates to ca. 5100-7000 BP.  Scale approximate.

 

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‘Trihedral’ refers to the triangular cross-section shape of the distal end of the point.  The cross-section is made by relatively flat pressure flaking on one surface followed by very steep pressure flaking on the opposite surface, creating a prominent ridge down the centre of the face.  The central ridge on this example is most clearly developed at the broken tip.

The arrowhead is curated by the Sharjah Archaeology Authority, catalogue number EXS08.