Final answer:
The most recognizable physical feature on a male lion is the mane.
Step-by-step explanation:
The most recognizable physical feature on a male lion is the mane. The mane is a thick growth of hair that encircles the lion's head and neck, giving it a distinct and majestic appearance. The mane also serves a social and reproductive function, as it signals the lion's maturity and dominance to other lions and potential mates.