I only know of two types that have been call "Arrowhead". One is embroidery in which you embroider a triangle shape at the top of the slit uses either split stitch, darning stitch or a stitch that I can't remember what its called. The other method was taking triangular piece of the same material as the garment or item to be "arrowheaded", fold in a bit of the tips, then the sides. Stitch down the turned under sides with a point facing up and a side going across the top of the slit. Think of the slit as the shaft of an arrow and the triangular piece the arrowhead and that is how it should look in alignment. You will want to stitch the interior of the arrowhead, this I have seen artistic license as from simple triangle within triangle to initials to geometrics. There is the option of satin stitching instead of hemming the triangle for less bulk. This is my understanding of Arrowhead and may not be what you are looking for or the "real" arrowhead for slits.
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