It feels like you can't talk about stock options without someone talking about the greeks. One of the first things a new trader learns right after how to deposit a paycheck into their favorite broker are the greeks
Delta Theta
Gamma..
I put together a simple graphic to (hopefully) make it easy to remember what they are and what they refer to.
I hope this was helpful and is useful for you in the next time you're trying to remember what delta or theta means. :)