Peculiarity (Noun)

An odd or unusual characteristic.

Nouns denoting cognitive processes and contents.

Her manner of speaking with a perpetual whisper was one of her most notable peculiarities.
The old mansion had a peculiarity in its floor plan, with a staircase that seemed to lead to nowhere.
His obsession with collecting antique door knobs was just one of his many quirky peculiarities.
The artist's use of vibrant colors and distorted shapes was a peculiarity that set her work apart from others.
The small town had a peculiarity in that all the street names were based on colors, with Red Street intersecting Blue Street.