sign: Guess What It Is for What's the Sign Wednesday

Trying something a little different this week for What's the Sign Wednesday - this week you get to guess ... What's the Sign!?  Hint - the sign starts with C (because it's C week) and vaguely related to the topic that I am finally going to the beach today!! I'm sure I'll have plenty of things to talk about tomorrow.

Any guesses!?

Good luck!