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16 pixels by 16 pixels is a common resolution for assets matching a low-res pixel art aesthetic. Although the assets may not be specifically 16x16, they are designed to work in a graphical setting where objects are around that size.

Typically small graphics that can be used to represent something, like items or actions

A perspective where the camera is placed directly above the player. Common in 2D games, but can also be used in 3D games.