The term 'KHAN' (Islamic title) can be summarized by the crossword solution 'AGA', which is a three-letter word. 'AGA' is an honorific title used in Turkey and other parts of the Middle East, and is derived from the Turkish word 'Agha'. It is often used as a title of respect for a man of high rank or authority, such as a tribal leader or a military commander. In Islamic countries, it is also used as a title of respect for a ruler or a nobleman.