It is in fact a variation of adding unusual characters, like the@ symbol, or the one (C enclosed in a circle) to indicate copyright.
Several years ago I did a handout for my VS students on doing this, and it works through the windows character map. Its attached as a pdf file. If you can obtain a math symbol font you like, and add it to the list of fonts in the windows character map, then this method should work for what you want to do.
Davidk
Attachment
Handout 7 - Obtaining Graphical Symbols in Video Studio text mode 2.pdf- (152.58 KiB) Downloaded 126 times