It is the oldest counting devices, which is still enjoying popularity with aplomb.
This interesting device has a rich history that covers half the globe.
It is believed that the Romans made improvements in the primitive abaci.
A series of wire or rods were used for counting beads, which were made of ivory or stone.
Surgeons treating a man with suspected food poisoning were stunned to discover 263 coins and 100 nails in his stomach.
Maksud Khan, 35, was admitted to hospital with abdominal pains and doctors performed an endoscopy to investigate the cause.
Ancient texts such as the Abhidharmakosa throw light on the use of abacus in India.
Relatives say he had slipped into a depression and might have got hooked onto eating metal objects.
"Whenever he felt the urge to ingest a coin, he ingested it with water," said a family member.
Some historians believe that the abacus was invented by the ancient Chinese while some believe that it was invented by the Babylonians or the Egyptians.
These claims are supported by historical evidence such as ancient texts and archaeological excavations.