I have not been able to locate braille symbols to be used for the graphing calculator keys which show only an arrowhead (no shaft) pointing to the right, or left, or up, or down. The arrowheads are simple, filled-in triangles. Thank you for your help.
It is important to note that these have not been approved as standard symbols by BANA, but according to Nemeth code, symbols may be devised by the transcriber to indicate signs of shape (provided that they are not already used by the code to mean something else).