17 so that no one can buy or sell unless he has the mark: the beast’s name or the number of its name. 18 This calls for wisdom: Let the one who has understanding calculate the number of the beast, because it is the number of a person. Its number is 666.
The Greek word used for “mark” is charagma which gives the meaning of something engraved or stamped. Mind you, the only way to buy food, material needs is by having identification on your body. The 666 on the body shows that, that person has chosen Satan over Christ and now belongs to the devil. The only way you can do business with people and for them to know which side you are on is by seeing a visible mark  on the body.
In verse 17, it says “that no one can buy or sell unless he has the mark”, the mark of the beast will work alongside with our currency. The name of the beast/antichrist or his number has to be visible for the buyer or seller to actually do business or else they won’t be permitted. The 666 can be seen as a permit to do business. But, it won’t be as we have permits today, a paper to carry with you, it will be on you.
Just look at our money, for instance, on the dollar or bill it has a distinct mark if seen through the light to show its authenticity. Anyone can counterfeit money but the mark on it shows if it belongs to the United States or it does not.
Let’s look at verse 16 which says, “16 And it makes everyone—small and great, rich and poor, free and slave—to receive a mark on his right hand or on his forehead”
Everyone is given something that is either tangible or visible as the word “receive” is mentioned. And, it is to be placed on our body, “the right hand or on the forehead”, where it will be the most visible.
John who wrote the Book of Revelation witnessed the future generation who would receive the mark of the beast, truly something noticeable was being put in their bodies as John saw or could tell that it was the beast’s name or number.
Some Christians believe that the mark of the beast, the 666 will be symbolic, that in itself is so dangerous to believe and teach to others. We are responsible for handling the Word of God properly and correctly by giving such an interpretation as being a symbolic Mark, the 666, you are setting people up to be deceived in receiving a visible mark, thinking to themselves it is symbolic so it’s okay to get it. You will be doing the opposite, instead of sending people to Christ, you will set them up to receive the antichrist, the devil.
We as believers must be better than this and especially spreading it around by reblogging it. You are doing great damage.
2 Timothy 2:15
15 Be diligent to present yourself to God as one approved, a worker who doesn’t need to be ashamed, correctly teaching the word of truth.