.. in Computing In computing, “..” represents the parent directory. It is used in file paths to navigate up one level in the directory hierarchy. Example: “`text /home/user/Documents/file.txt “` To access the parent directory of this file, you can use: “`text /home/user/Documents/.. “` This will take you to: “`text /home/user/ “` .. in Regular Expressions In regular expressions, “..” is a quantifier that matches zero or more occurrences of the preceding expression. It is equivalent to the star quantifier (“*”). Example: “`regex a..b “` This regular expression will match strings that have the letter “a” followed by zero or more characters, followed by the letter “b”. .. in Mathematics In mathematics, “..” is used to represent a range of values. It means “from” to “to”. Example: “` x ∈ [1, 5] “` This means that x is in the range from 1 to 5, including both 1 and 5. .. in Other Contexts Additionally, “..” is also used in: * Programming languages: As an ellipsis to indicate that code is omitted. * Spreadsheets: To create a reference to a range of cells. * Unicode: As a placeholder character in text encoding. * File extensions: To indicate a hidden file (e.g., “.hiddenfile”). * Markup languages: To indicate a parent element in XML and HTML. * Natural language: To represent a pause or interruption in speech… (two dots) is a special syntax in programming languages and operating systems that refers to the parent directory of the current directory. It is used to navigate up one level in the directory hierarchy... (two dots) is a special syntax in programming languages and operating systems that refers to the parent directory of the current directory. It is used to navigate up one level in the directory hierarchy. In File Paths: * In file paths, .. represents the directory immediately above the current directory. For example, if you are in the directory `/home/user/Documents`, using .. in the file path `/home/user/Documents/../Pictures` will take you to the `Pictures` directory, which is one level up. In Programming Languages: * In programming languages, .. is often used as a relative path operator. For example, in Python: “`python import os # Get the current working directory cwd = os.getcwd() # Move up one directory os.chdir(“..”) # Print the new working directory print(os.getcwd()) “` Advantages: * Using .. provides a convenient way to navigate to the parent directory without having to know its absolute path. * It allows for dynamic path manipulation within programs. Limitations: * .. cannot be used to navigate above the root directory. * It may not be compatible with all programming languages or operating systems. Example: Consider the following directory structure: “` /home/user ├── Documents │ └── files └── Pictures “` If you are in the `files` directory, using .. in the file path `/home/user/Documents/files/../Pictures` will take you to the `Pictures` directory, which is the parent directory of `files`.City Council Approves Controversial Development Project The City Council voted 5-2 on Wednesday to approve a controversial development project that has drawn fierce opposition from residents. The project involves the construction of a 20-story luxury apartment building in a historic neighborhood. Opponents of the project say it will ruin the character of the neighborhood and worsen traffic congestion. They also argue that the building is too tall and out of scale with the surrounding architecture. Supporters of the project say it will bring much-needed housing to the city and generate tax revenue. They also claim that the building has been designed to be sensitive to the neighborhood’s historic character. The project has been the subject of heated debate for months. The City Council’s vote came after several hours of public testimony, both for and against the project. The project’s developer, XYZ Properties, has promised to address the concerns of residents by including affordable housing units in the building and by making traffic improvements to the surrounding area. Construction on the project is expected to begin in the spring.