I've implemented a custom bash prompt by exporting PS1 in my .bashrc, but I'm using a unicode character that appears very small unless the font size is changed. Unfortunately that means text looks ridiculous. Is there a way to change only the font size of that single character to a larger one so as to make it more clearly visible?
There is no escape code for text size (source). Therefore, there's no way to resize a single character in terminal.
Your best bet will be to look through Unicode and find a larger version of the same character. Or you could make the character bold.