ATM - An option is at the money (ATM) if the strike price is the same as the current spot price of the underlying security. An at-the-money option has no intrinsic value, only time value. For example, with an "at the money" call stock option, the current share price and strike price are the same.
DTE - Days to Expiration (DTE) The term days to expiration (DTE) refers to the number of days until an option expires.