2digit.org

The TI-83 calculator, the gold standard of graphing calculators in the 90s and 00s. Ideally you had the TI-83 Plus so you could play Block Dude.

Base 85: A way of converting pure binary data into ASCII. 85⁵ ≈ 2³², so every 5 ASCII characters can represent 4 bytes. Despite being more compact than Base 64, it's rarely used due to lack of standardization and use of metacharacters like < and " which may require escaping, reducing its efficiency.

When something is 86-ed, it's canceled. "The term eighty-six was initially used in restaurants and bars according to most late twentieth-century American slang dictionaries. It is often used in food and drink services to indicate that an item is no longer available or that a customer should be ejected."

Abraham Lincoln's famously short Gettysburg Address began with "Four score and seven years ago", which is just Abe's cool way of saying 87. (A score is 20.)

In Back to the Future, the Delorean time machine can only time-travel after it hits 88 miles per hour.

The infamous "Hitler Number". 88 is used as a neo-Nazi code to mean "Heil Hitler". H is the 8th letter of the alphabet, so 88 = HH.