LAYS' (4 letters) The term 'Vegas Number' refers to the ODDS of a particular event occurring. The crossword solutions for this term are 'ODDS' and 'LAYS'. ODDS are the probability of an event occurring, expressed as a ratio of the number of favorable outcomes to the number of unfavorable outcomes. For example, if the ODDS of winning a game are 3:1, then for every three wins there will be one loss. Lays, on the other hand, refer to the opposite of taking the ODDS. This means betting against the ODDS, or betting that an event will not occur. In gambling, this is known as laying the ODDS.