While end time prophets believe the numbers 666 is the number of the beast mentioned in the last Biblical book of Revelation, there are different opinions what the real mark of the beast is, which would be the sign of the anti-Christ.

Among the popular interpretations of Revelation 13:18 are the verses refer to a tattoo, brand or a microchip implant. As technology improved, the implant or medical or financial electronic ID chips became closer to a reality.

Last week, Motorola announced at the All Things Digital D11 Conference that it is working on the Motor X phone and wearable authentication in the form of digital tattoos, which could either be an electronic chips imbedded into the human body or a daily authentication vitamin.

The MC10-made chip has an antenna and sensors on it to authenticate Motorola smartphone users, which would be the preferred option that entering a PIN number at least 39 times a day.

The authentication pill contains a small chip with a switch and an inside-out potato battery which when swallowed triggers the stomach acids that serve as electrolyte and powers up the chip. It then creates an 18-bit ECG-like signal in the body, in effect making the entire body the authentication token.

Once the vitamin authentication tablet is ingested, it powers on various devices such as phones and computers and even doors and cars.

Ancient thinking on the mark of the beast explains the use of the term to the imperial seal of the Roman Empire used on official documents during the 1st and 2nd centuries.

In the year 66, when Nero was emperor, the Jews revolted against Rome and coined their own money, which New Testament scholar Craig Hill suggested symbolised the economic power of Rome which had coins that carried the emperor's image. However, during the 1st century, Christians refused to even carry, look at or manufacture coins that had idolatrous image, which made it difficult for them to participate in trade and the general economic life.

The Web site Nairaland sees the modern adaptation of the mark of the beast in the Obama Health Care law which it claimed requires all Americans to have a Radio Frequency Identification implanted on their right hand skin or forehead to access medical services.

OpEdNews.com, however, debunks that the Obama Care law requires RFID microchipping, stressing there is no provision in the law that requires it. The site quoted an RFID expert, Dr Katherine Albrecht, who discusses the issue in the following audio file.

It should be noted, however, that the U.S. Food and Drugs Administration has approved in 2004 for use in humans implantable microchips, which Ms Albrecht pointed out are in wide use today as implantable medical devices such as pacemakers, artificial hips, drug delivery pumps and heart stents.

What an unapproved version of the health care introduced in 2009, HR 3200, was to propose the mandated creation of a registry of implanted medical device to evaluate their post-market risk and patient safety over time.