is a hex key the same as an allen key
Hex key A hex key, Allen key or Allen wrench is a tool used to drive bolts and screws with hexagonal sockets in their heads.
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
Bracket Forms include round (also called "parentheses"), square, curly (also called "braces"), and angle brackets (also called "chevrons"); and various other pairs of symbols.
Computer data storage Data are encoded by assigning a bit pattern to each character, digit, or multimedia object. Many standards exist for encoding (e.g., character encodings like ASCII, image encodings like JPEG, video encodings like MPEG-4).