Here's my biblical take on the Mark of the Beast. It's definitely not any physical mark, bar code tattoo, chip implant, or any device like that. I don't think it relates to anything "physical" at all. Why ? The biblical symbolism used is pretty clear. "And it shall be for a sign unto thee upon thy hand, and for a memorial between thine eyes, that Lord's law may be in thy mouth" (Exodus 13:9). "And it shall be for a token upon thy hand, and for frontlets between thine eyes" (Exodus 13:16). The later Jewish practice of wearing "phylacteries" (parchment scrolls) on their forearms and on their foreheads is universally viewed by most conservative Christian Bible scholars as falling short of what God intended by these instructions. The command was to be taken "figuratively" not literally. Just check any Bible commentary on these verses.
In the Bible, the "forehead" is used figuratively to symbolize a person's character, their strengths such as "courage" (Ezekiel 3:9), and weakness like "stubbornness" (Isaiah 48:4). Obviously, the choice of locating the "Mark" in ones forehead, has nothing to do with anything physical.
The "right hand" is also mentioned variously throughout the Scripture as representing someone (as with God), taking action, (Exodus 15:6-12, Isaiah 41:10). Again. The right hand is not to be taken literally, but symbolically.
Obviously, the "Mark of the Beast" refers to the "thoughts" and "actions" of those who worship the beast system through identifying with it's ideology by thought, or by direct action. That's my take on it anyway.