The paisa (Bengali: পয়সা, Hindi: पैसा, Urdu: پیسہ) is a monetary unit in several countries. Linguistic variants of paisa include poisha (Bengali: পয়সা, in Bangladesh) and baisa (Arabic: بيسة, in Oman). In India, Nepal and Pakistan, the paisa currently equals 1⁄100 of a rupee. In Bangladesh, the poisha equals 1⁄100 of a Bangladeshi taka. In Oman, the baisa equals 1⁄1000 of an Omani rial.
The word paisa is from Hindi & Urdu paisā, a quarter-anna coin, ultimately from Sanskrit term padāmśa meaning quarter part, pada - foot or quarter and aṁśa - part.
Until the 1950s in India and Pakistan (and before 1947 in British India), the paisa was equivalent to 3 pies, ¼ of an anna, or 1⁄64 of a rupee. After the transition from a non-decimal currency to a decimal currency, the paisa was known as a naya paisa ("new paisa") for a few years.
Read more about Paisa: General Usage of The Term, Example Currency