distinctive
Clearly different in a way that makes it easy to recognize.
Distinctive means having a special quality that makes something easy to recognize or different from everything else. When something is distinctive, it stands out in a way you can't miss.
A lighthouse has a distinctive pattern of light flashes so sailors can identify which lighthouse they're seeing, even in the dark. Your best friend might have a distinctive laugh that you'd recognize across a crowded cafeteria. The Eiffel Tower's distinctive iron lattice design makes it instantly recognizable, even in photographs.
The word suggests a memorable feature that becomes something's signature. Something distinctive has a quality that defines its identity. A teacher might have a distinctive way of starting class with a particular phrase. A restaurant might be known for its distinctive spicy sauce that no other place makes quite the same way.
Notice that distinctive usually describes positive or neutral qualities, not flaws. We talk about someone's distinctive voice or distinctive style. When you develop a distinctive approach to solving math problems or writing stories, you've found something that makes your work yours. Being distinctive means having an identity that others remember and can't easily confuse with anything else.