The phrase "a notable sign" is correct and usable in written English.
You can use it to refer to something that is significant or worthy of attention, often in the context of indicating a change or an important observation.
Example: "The increase in community engagement is a notable sign of progress in our outreach efforts."
Alternatives: "a significant indicator" or "a remarkable signal".
The landscape was parched, and the most notable sign of life was a pack of goats chewing their way through a mound of trash.
For the human observer, the most notable sign of their decline might be the increase in night herons.
It was the first notable sign of progress in what military analysts say will be an arduous slog for the army against a resilient enemy.
One notable sign of the boom, perhaps, is that some big players, like Donald J. Trump, are lending their names to half-billion-dollar projects.
HuffPost Latino Voices asked our readers to tag their photos with #LatinasMarch and now we've collected some of the hashtag's best images, plus a few other notable signs we found online. .
A 20% decrease in the value of Mn was observed with no notable signs of cytotoxicity in the implantation area [ 19].
Notable signs of renewal, including interest in devotional literature and the mystical tradition, also emerged out of the devastation wrought in Germany by the Thirty Years' War (1618 48).
Another notable signing is English striker James Keene, who has spent the majority of his career playing in Sweden after leaving Portsmouth in 2006, as well as Zambian Africa Cup of Nations winner Isaac Chansa and Greek international goalkeeper Alexandros Tzorvas.
But even with the notable signs of discontent and rebellion against Islamist fundamentalism, which are the hallmark of many young people in Iran, I doubt that any of them will raise their voice if and when the Islamist regime redirects their venom from the Jewish state to the representatives of international Zionist imperialism in their midst.
