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A may refer to any of the following:
1. A: is a physical drive on older PC or IBM compatible computers, the A: drive DENOTES the 3.5-inch or 5.25-inch floppy disk drive. Often, the A: drive is configured in BIOS setup as the first bootable drive on IBM-compatible computers.
By having the drive as the first boot device, the computer can boot from a bootable floppy diskette to install an OPERATING system and fix and repair a computer.
Today, the A: drive is more or less obsolete and replaced by the CD-ROM and USB flash drives.
2. In gaming, when using the WASD keys to control a character or another object, the "A" is the same as the left ARROW key.
3. A* (pronounced "A-star") is an algorithm for pathfinding and traversing a graph data structure. It was developed in 1968 by researchers at Stanford University and is widely used today―notably in computer GAMES. When a video game character moves and navigates around obstacles or terrain, the A* algorithm was likely used to calculate the path.
4. A is a key used with the keyboard shortcuts Alt+A, Command+A, and Ctrl+A.
5. With Perl, \a is a bell or alarm. With a REGULAR expression, \A matches the start of a multiline string.
6. With Microsoft Excel and other spreadsheet programs, "A" is the first column of a spreadsheet. To reference the first cell in the column, you'd use "A1."
7. In the phonetic alphabet, "A" is often pronounced as "alfa."
8. A is the first letter of the English alphabet, followed by the letter "B." To create a capitalized "A," press the Shift and A key at the same time.
With U.S. QWERTY keyboards, the "A" key is on the home row, to the right of the Caps Lock key, and left of the "S" key. See our keyboard page for a visual example of all keyboard keys.
NoteIf the "A" key is not working on the keyboard, see: Some of the keys on my computer keyboard aren't working.
TipIn ASCII the uppercase "A" is "065" in decimal (01000001 in binary). The lowercase "a" is "097" in decimal (01100001 in binary).
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