Visual Basic is the first programming language with an exemplary number of variable naming rules. The msdn.microsoft.com article explains the rules well. To start a word you must use a letter of the alphabet as the first character. You cannot use a space, nor a period, nor an exclamation mark, or the special characters of @ (at), & (and), $ (dollar sign), # (pound key) in the name. The name cannot surpass 255 characters in total length either. Names have to be precisely identified if the variable name is the same as an already existing one. You cannot repeat names in the same scope without the name being a different variable type. Lastly, while Visual Basic is not case-sensitive, it keeps the capitalization in the statement where the name is defined. Python is the next programming language where it gives you slightly more freedom for a variable name. A name must begin with a letter, lowercase or uppercase or an underscore. Python is case sensitive as well, consistency is important for read-ability. The variable name can be any “reasonable” length according to w3resource.com. Lastly, there are some reserved words Python uses for other things, which yourself cannot use. Java is the last of the three programming languages and no surprising exception to the naming rules. Names are case-sensitive, while you can begin a variable name with the $ sign or _ symbol, it is highly discouraged. The docs.oracle.com documentation of Java variable names tells the reader to always change an auto-generated name if it begins with a $ sign. White space is not allowed, either. The site recommends to use full words, rather than abbreviations, to make the code easier to read and be understood. Keywords or reserved words are also existing in Java with certain names you cannot use as Java reserves them to their own purpose. The camelCase naming convention is highly encouraged in Java.