The term 'converge on' can be expressed in three different ways in a crossword puzzle. The first is 'ZIN', which is a 3 letter word meaning to come together or meet at a common point. The second is 'ZEROIN', which is a 6 letter word meaning to focus on a particular target or goal. The last is 'CLOSEIN', which is a 7 letter word meaning to approach a particular destination or point. All three words refer to the same concept of coming together or meeting at a common point.