The subject of your question is quite difficult because it touches on areas far removed from everyday life such as beliefs, ideas and certain groups of people who come together around these beliefs.
In order for you to fully understand the answer, we therefore recommend that you read it with an adult.
According to the "Dictionary of Symbols" by Jean Chevalier and Alain Gheerbrant, under the word "eye", we can read a lot of information including the following:
"The single eye, without eyelid, is also the symbol of the Essence and divine Knowledge. Inscribed in a triangle, it is in this sense a symbol that is both Masonic and Christian.
The divine
Seeing Eye everything is still represented by the sun: it is the eye of the world. The eye of the world is also the hole at the top of the dome, door of the sun, which is the divine gaze embracing the cosmos,"
In this same dictionary, you will find the word "Triangle". Here is a very short passage of what is stated under that word:
"The equilateral triangle symbolizes divinity, harmony, proportion. The equilateral triangle, in the tradition of Judaism, symbolizes God, whose name it is forbidden to pronounce. We know the importance accorded by Triangle Freemasonry, which it calls the "Luminous Delta"
And finally, here is what you can read under the word "Three", a highly symbolic number:
To help you understand what "Freemasonry" is, here is a definition from the book "Who is behind Freemasonry
Freemasonry is an association of free men, which traces its origin to the corporations and brotherhoods of the Middle Ages. It admits within it men who come together in complete fraternity to work for their moral and spiritual improvement. The Freemasons recognize themselves as brothers and consider their alliance as an alliance of brothers. "
The Dictionary of Symbols further explains that In the Masonic tradition, the
eye symbolizes on the physical plane the visible Sun from which emanate Life and Light; On a spiritual or divine level, the Great Architect of the Universe. "
The eye is placed in a triangle. This also has a meaning as explained in the "Lexicon of Masonic Symbols":
In Freemasonry, this triangle is called the Luminous Delta, and it is often adorned with flames that seem to come out of it, or rays of light.
By the simple fact that people meet each other on a regular basis, in a discreet manner, and do not admit anyone else to these meetings without "showing a white paw", as is commonly done in private clubs, it makes people talk those from outside. Freemasons are no exception to the rule. This obviously generates suspicion: they hide, it is unhealthy; they are silent, it is because they are afraid to reveal what they are doing; so it is that they are doing something illegal or perverse, perhaps they are plotting against the state, or they are practicing magic, alchemy, or they are having black masses; Freemasonry was frequently struck with the infamous seal of satanic sect.