sign
The Italian word 'segno' is used in the same way as the English word 'sign'. It can refer to a symbol, mark, or indicator used to convey information or instructions. For example, a traffic sign in Italian is called 'segno stradale'.
Your zodiac sign says a lot about you.
In this sentence, 'segno' is used in the context of astrology where it refers to one's zodiac sign. Zodiac signs, according to astrology, can reveal certain personality traits or tendencies.
It's a sign that we shouldn't ignore.
In this example, 'segno' is used to mean a signal or indication of something. This phrase could be used if there is a clear warning or indication that something should be attended to or not ignored.
He left his mark on this project.
Here, 'segno' refers to a lasting impact or significant contribution. The phrase could be used when someone has made a noticeable or important contribution to a project.