dark blue

Quick answer：

Dark blue is a color with a dominant wavelength of around 490 nm. It is a primary color in RGB color model and has a significant presence in the sky and ocean. Dark blue is often associated with depth, stability, and intelligence. In cultural contexts, it can symbolize tranquility, wisdom, or depression. It is also a common color used in branding, such as in the logos of social media platforms and corporate identities.