This is the 10522nd most frequent Russian word.
визиткой
"Визиткой" means "business card."
In this sentence, 'визиткой' refers to a business card, highlighting its purpose as a contact object.
Я воспользовался её визиткой, чтобы позвонить.
I used her business card to make a call.
Here, 'визиткой' metaphorically refers to a distinguishing feature, acting as an identifier or representative aspect of the shop.
Магазин на углу выделился яркой визиткой.
The shop on the corner stood out with a bright sign.
In this context, 'визиткой' symbolizes a characteristic trait that represents someone's identity or uniqueness.