The person I consulted with pointed out to me that Larry’s Speakeasy addresses these very symbols.
There are no spaces in the examples, not even around the arrowhead.
All of these examples are shown on this page:
http://s22318.tsbvi.edu/mathproject/appB.asp?MV=Next&Pg=1&s=6
I am also attaching a document with the symbols in simbraille.