Occult knowledge is, for obvious reasons, hard to come by (ocultare in Latin, to hide, itself sharing a root with oculus, eye). A basic concept, however, is the masonic white and black chequered floor interspersing light and dark. Indeed we say that someone's life was chequered, that is, interspersed with light and dark patches. A chess board follows this pattern and he who is a chess master controls all the pieces placed on the chequered board. Also masonic is the square as symbolising, along with the chequered floor, base consciousness and the hypercube which represents a prison and mental control. These themes - and this is just the tip of the iceberg - are present in policeman regalia and graduation ceremonies.
The graduate hat consists of a black square over a circular cap. The colour black itself in occult symbology signifies darkness, and thus that the graduate is not in fact enlightened, for if he were, he would be dressed in white, wearing a white hat. Moreover, by placing the square, base consciousness, over the circle on the crown chakra, occultists are basically saying that graduates - who have made the grade and have spent years in a graded and gradated system - are in low consciousness.
For, as we said, in freemasonry the circle is higher than the square - to be 'on the square' - as in baseball - is to be of a low consciousness level. This is revealed in the above masonic symbol of the compass and square. Researcher Mark Passio also adds that the diploma wrapped in a ribbon - a wand that does nothing - is a symbol for impotence. Graduation has not made you free, but prepared you to serve in the workforce.
It can be countered, superficially perhaps, that the throwing of the graduate hats in the air
reveals the throwing off of the black square and hence liberation. If this is in fact the case is for each and everyone to gage for him or herself.
In England, police officers are also ritually mocked by the very uniforms they wear. This classic UK police officer hat has a chequered black and white band around the crown chakra. This is occultists making fun of the base consciousness of human beings who have given up on their free will and responsibility to do the bidding of their owners - the same occultists - at the expense of other sovereign human beings. They are order followers, act on someone else's whim and command, and are not enlightened individuals. The symbology is fitting if one takes a poor view of law enforcement generally.
Precisely on the third eye chakra, one of the most important chakra symbolising wisdom, UK police officers have a double square. That is, not only are they not enlightened, like the graduates above, but they enforce their lack of enlightenment on others. Again, this is occult mockery of law enforcers who do the bidding of the establishment.
The above is a hypercube which is a generally dark occultic symbol symbolising control, prison consciousness. In the US, STOP road signs originate from the occult hyper cube which is clearly revealed in their outline.
And so do US police hats follow the same outline above the crown chakra.
Conclusion: The extent of occult symbology in official regalia goes very far, not to mention corporate logos, road signs, coats of arms and so forth. I recommend Mark Passio's series of videos on demystifying the occult to shed some light on these occult symbolic meanings and how the non-initiate profane - i.e. the general public - are routinely mocked and made fun of without them knowing it.