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Arrays could be considered an extension of an existing variable's type: arrays cannot exist as a type on their own but act just to extend an existing variable. An array applied to a variable implies not a single variable but a series of variables of a single type indexed by integers starting from zero. The characters used to indicate an array are '[<var>x</var>]' where '<var>x</var>' is the number of variables in the series. For example, a single integer variable would be defined by <tt>int</tt>, but an array (series) of seven integer variables could be defined by <tt>int</tt>. Assuming this variable had the name <var>a</var>, the individual integer variables could be accessed as <tt>a</tt>, <tt>a</tt>, <tt>a</tt> and so on until <tt>a</tt>. The integer used to index the series of variables is also known as a ''subscript''.