Almost every Lego piece (including minifigures) have the word LEGO printed on it. Bricks of other brands like Megablock and Kreo don't. Sometimes I need to use magnifying glass to see. Yah, I'm old!

Funny story about this - when I was trying to swap my minifig from the Shell promo polybag with the staff at LLM, they sometimes will look inspect the minifig closely to identify the LEGO printing to confirm it's a genuine Lego minifig. Either I look like a shady character or they've been duped by some folks swapping fake minifigures.