Why do people call it a PIN Number?
828027
I think people feel incomplete by just saying the acronym.  For example, "you need your PIN" just seems incomplete somehow.  I do not know what in our brain chemistry makes us want to add the last word to an acronym, but it seems to happen.  automatic teller machine machine (ATM machine, PIN number).  I think it happens more often when part of the acronym is a noun that describes the thing as well.
208269
It's called Morse Code
533811
The numbers on a computer number-pad are designed for easy entry of a whole series of numbers - number-crunching as it were (these are the true confessions of a former accountant!) - having the zero on the bottom is the quickest arrangement for rapid data-entry; the numbers on a phone / ATM (and remote controls) on the other hand are designed as a replacement for the rotary dial which had that same sequence, and also included the letters of the alphabet - which is the basis of the current SMS / text messaging system. You don't need to enter as many numbers on a phone key-pad, and having the numbers and letters both arranged in ascending order helps us to remember the association.
531711
It is a custom chip that is not sold as a discrete component. As such the manufacturer does not need to release the pinouts, nor do they want to it seems.
365175
It actually refers to a memory location whose address\nin hex is 800H or in decimal it is 2048D.
447067
Well, it helps me know what side of the street a house or building will be on.  If I see that odd numbers are on the left side of the road, and there is an odd number on my address, then I know that I'll have to be prepared to turn left!\n\nAlso, if all the even numbers and odd numbers were on the same side of the road, what would be on the OTHER side of the road?  More numbers I guess, but I think that having it the way that it is just makes it easier to find things.
781791
They are the same. At some places you will be asked not to enter your pin when choosing the Credit Card option and instead have to sign for it.
291336
Many of the pins represent awards and honors that they've received. Other pins/patches are simply identifying them as a soldier and showing their rank.
474200
In the United States, a Social Security number (or SSN) is a number issued to citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as 42 U.S.C. § 405(c)(2). The number is issued to an individual by the Social Security Administration, an agency of the federal government. Ostensibly, its primary purpose is tracking working individuals for taxation purposes and to track Social Security benefits. However, in recent years, the SSN has become a de facto national identification number, even though it is not supposed to be used as a form of identification.\nGenerally, numbers were assigned beginning in the northeast and moving westward. So people on the east coast have the lowest numbers and those on the west coast have the highest numbers. As the areas assigned to a locality are exhausted, new areas from the pool are assigned, so some states have noncontiguous groups of numbers.\n\nComplete list of area number groups from the Social Security Administration \nThe middle two digits are the group number. They have no special geographic or data significance but merely serve to break the number into conveniently sized blocks for orderly issuance. \nThere is a theory that the two middle digits can be used to identify a person's ethnic background. African Americans, Asians and people of color will almost always have an odd middle number, while Caucasians will have an even number. This is debunked as an urban legend on snopes.com. \nThe group numbers range from 01 to 99. However, they are not assigned in consecutive order. For administrative reasons, group numbers are issued in the following order:\n\nODD numbers from 01 through 09\n\nEVEN numbers from 10 through 98\n\nEVEN numbers from 02 through 08\n\nODD numbers from 11 through 99\n\nAs an example, group number 98 will be issued before 11.\n\n\n\n\nThe last four digits are serial numbers. They represent a straight numerical sequence of digits from 0001-9999 within the group.
280358
It stands for Universal Serial Bus.  It is called this because many different devices use it.
790059
You could be waiting forever. A pin number is just to help you complete and adjust it. It doesn't mean anything.\n\nIF you are approved, you'll get it before school starts. If you're not, you'll get a letter telling you why.
611719
headpin or better yet pinhead, lol
32115
Actually it is called a process (without the trailing 'or') ID. All memory-resident programs have a process ID (us in the computer field call it a PID for short). This is mainly due to the fact that PIDs were first notable (not first period, i ma sure others used this beforehand) use of PIDs was in the UNIX Timesharing OS. There are a number of reasons that programs have PIDs, and if you ever tried to debug several instnces of a program running at once, it's a lot easier than going by the program name, esp. if the same name shows up 15 or so times :)
320483
I work for in a call center for a cable company. I give my first name and last initial and my extension number. The reason why I don't give out my last name is for my own personal safety. I have had people threaten me and telling me that they will be out in the parking lot waiting for me at night. I do not want people that are that upset about thier cable being turned off for whatever reason looking up my name and address. You would be surprised at the types of calls and threats that we deal with on a daily basis. It is very scary. If I worked for a call center that was in another state, I wouldn't hesitate because people are less likely to track me down a few states away. But since I work in a local call  center, I will never give out my last name. I hope this answers your question. We are not being rude, just concerned for our personal safety. I wish that you could hear some of the calls that we take.
478035
call the 1-800 number on the back of the card to customer service to set up the pin.
1181393
Binary digits stand for powers of 2.  For example, 2^0 is 1, and 1 in binary is 1.  2 is equal to 2^1, so 2 is 10 in binary.  3 is 2^1 + 2^0, so it's 11 in binary.  \n\nSo the joke is really saying there are 2 types of people.  Now you fall into the former.  :-)\n\n*** There are two types of people, those who know binary and those who don't, now you fall into the former category of those who know.
504858
This is a system reserved name.  The same happens with other system reserved names:  CON, AUX, COM1, COM2, COM3, COM4, LPT1, LPT2, LPT3, PRN, NUL