How do I type this symbol on MacBook Pro keyboard?

[Phwoar]

Hi all,
How do I type the following particular command on the MacBook Pro keyboard?

I'm using a privately-produced application in Mojave that has non-adjustable keyboard commands. The programmers have set it up so a user needs to use this command to "apply" a certain algorithm to a selected piece of text within the application (much like we would select text and apply a "command+b" for bold in most word processing apps).

So the issue I'm having:
I can't for the life of me work out how to type the second aspect of the keyboard combo. I can select it in a special menu, but I can't work out how to type it.

Basically the menu item is the "Command" key held down together with what looks like a backwards '

So Command + ' (except the little inverted comma, if we zoomed in on it, would look like this \ )

It's confusing as heck.

Thanks for any help the hive mind can provide!

 

[Pakaku]

That's the grave accent, which is on a key next to the 1 key if you're on a US Keyboard or similar layout

 

[Phwoar]

Brilliant - worked, and thank you very much!