You can create your own custom arrowheads.
Arrowheads are stored as block definitions. To use your own arrowhead, provide the name of a block definition.
Arrowhead sizing relies on the overall dimension scale factor. When you create a dimension, the block is inserted where the arrowheads would normally go. The object's X and Y scale factors are set to arrowhead size overall scale. The dimension line is trimmed by text gap x overall scale units at each end. To trim the dimension line, the rightmost block is inserted with a zero rotation angle for horizontal dimensioning. The leftmost block is rotated 180 degrees about its insertion point.
If you use paper-space scaling, the scale factor is computed before applying it to the arrowhead size value.