There is a small typo in the wiki, where it says:
https://wiki.keyboardmaestro.com/manual/Calculations
As you can see there are three italicized zeros instead of visible underscores.
No doubt that's because the person who wrote that line didn't realize the underscores would be used to italicize text in this context.
Hello Airy (@Airy)
Moved this Topic to the Wiki Category because it’s Wiki related … everything that’s either a typo or suggestive for changes should be posted in this category so Peter is aware of it and can fix it more quickly.
Greetings from Germany 
Tobias
Thanks, sorry, I was unaware that there was a "wiki" category.