The thing that is so special about the number 6 is that the number 6 holds a status that unique across math as well as history and nature.
The number 6 is also celebrated as being the first "perfect number" as the number 6 has proper divisors like 1, 2 and 3 that add up to exactly the number 6 itself.
And beyond just math and mathematics, the number 6 also very frequently symbolizes balance, harmony and interconnectedness.
The number 6 is the only number that is both the sum as well as the product of it's first three positive divisors, which are 1 + 2 + 3 =6 and 1 x 2 x 3 =6.
In nature's geometry, the hexagon as a 6 sided shape is also the most efficient geometry in nature.
And it also frequently appears in the physical world from snowflakes, honeycombs and even the structure of benzene molecules.
The number 6 also has cultural as well as symbolic meaning and it's deeply embedded in belief systems, with many traditions also acknowledging the 6 days of creation.
And the Star of David is also a six pointed star, and even many board games are built around the 6 faces of a standard die.
In numerology, the number 6 is also often considered to be the "mother" or "father" of all numbers and symbolizes harmony, service, compassion and a strong devotion to home and family.
And in aviation as well as military contexts, a horizontal clock face analogy is also used to indicate directions.
Also because the 6 o'clock is also directly behind a person, "got your6" also had become a popular slang phrase that means "I am watching your back".