A wave symbolized as one of the strongest forces on Earth. So strenght for one. Also, if you read more into it, it's about faith; a wave is you against mother nature, you cannot control it, you just have to put faith into her.
Beautiful calming wave on a beach. The foam from the waves crashing on the land shown is shown in black and white and the soft light adds even more of a calming sense for minimal styling and inspiration.