Unicode in Github markdown

I believe the correct answer is to use unicode characters of the following (decimal) form

►
˿
ॠ

the above become:

► ˿ ॠ

Try it for yourself on Github and see. You have to paste the raw character strings, not the unicode symbol itself. It's not about what shows up in your editor, it's what actually displays on github.com.

There's no special syntax, just use the character directly... ☮.