Logos is logic: facts, numbers and reasons. Same root as biology and logic.
Logos is the third tool: reasoning and evidence. The same word gave us '-logy' and 'logic'. Aristotle thought a good argument needs all three, not just this one.
Comparing price per pound at H-E-B before buying brisket. Pure logos.
'Our pilot doubled sign-ups in a month.' That's logos. Lead with the number, then the story.
Practice it in Skepsis