Thread: I dont understand a piece of this code

Code:

void morse_code_letters(char morse_strings[91][6])
{
	//morse code letters using string copy
	strcpy (morse_strings['A'], ".-");
	strcpy (morse_strings['B'], "-...");
	strcpy (morse_strings['C'], " -.-.");
	strcpy (morse_strings['D'], "-..  ");
	strcpy (morse_strings['E'], ".");
	strcpy (morse_strings['F'], "..-.");
	strcpy (morse_strings['G'], "--.");
	strcpy (morse_strings['H'], "....");
	strcpy (morse_strings['I'], "..");
	strcpy (morse_strings['J'], ".---");
	strcpy (morse_strings['K'], "-.-");
	strcpy (morse_strings['L'], ".-..");
	strcpy (morse_strings['M'], "--");
	strcpy (morse_strings['N'], "-.");
	strcpy (morse_strings['O'], "---");
	strcpy (morse_strings['P'], ".--.");
	strcpy (morse_strings['Q'], "--.-");
	strcpy (morse_strings['R'], ".-.");
	strcpy (morse_strings['S'], "...");
	strcpy (morse_strings['T'], "-");
	strcpy (morse_strings['U'], "..-");
	strcpy (morse_strings['V'], "...-");
	strcpy (morse_strings['W'], ".--");
	strcpy (morse_strings['X'], "-..-");
	strcpy (morse_strings['Y'], "-.--");
	strcpy (morse_strings['Z'], "--..");
	// morse code numbers using string copy
	strcpy (morse_strings['1'], ".----");
	strcpy (morse_strings['2'], "..---");
	strcpy (morse_strings['3'], "...--");
	strcpy (morse_strings['4'], "....-");
	strcpy (morse_strings['5'], ".....");
	strcpy (morse_strings['6'], "-....");
	strcpy (morse_strings['7'], "--...");
	strcpy (morse_strings['8'], "---..");
	strcpy (morse_strings['9'], "----.");
	strcpy (morse_strings['0'], "-----");
	// morse code characters using string copy
	strcpy (morse_strings['.'], ".-.-.-");
	strcpy (morse_strings[','], "--..--");
	strcpy (morse_strings['?'], "..--..");
	strcpy (morse_strings[' '], " ");
}

I dont understand why the [91] and [6] are there. What do the numbers mean? and what do they do?