Swastika is Hinduism
If Hinduism can be represented by a single symbol, then it is swastika.
Swastika is derived from Sanskrit and means Well Being. It is easily the most replicated single symbol.
Place in Hindu religion and culture.
Ganesha is our first deity to be invoked on any religion occasion. He is considered to be the Remover of Obstacles and difficulties. He is also represented by the swastika. In fact, swastika is also called Ganeshji.
The symbol is drawn on altars. An altar is incomplete without it.
In Ayurveda, it is the symbol displayed outside a physician's house. In stores selling Ayuvedic medicines, it is painted on the sign boards. Many other shops too display it.
When a Hindu buys a vehicle, a priest blesses it and a swastika is drawn on it, which fades away with time. It is printed on the invitation cards, on a single card it might be replicated 20, 30 times. Envelopes for cash gifts on various occasions have it printed on them. Traders paint it on their cash chests, first page of account books etc. An average Hindu household might have dozens of swastikas. All the temples have it, of course, in metal, stone etc.
Swastika, drawn slightly differently, is a holi symbol in Buddhism too. So in every Buddhist country, you will find it everywhere.