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You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules. A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9).
If the array is multidimensional, you must specify a subscript for each dimension. For example, MD[5][3][9] identifies an element in a three-dimensional array called MD. Different programming languages have different rules for specifying subscripts. For example, the BASIC language uses parentheses in place of brackets. (2) In word processing, a character that appears slightly below the line, as in this example: H20. A superscript is a character that appears slightly above the line.