Symbols appear on Chainlife NFTs when they're paused. The icons displayed in the four corners communicate the current state of the Chainlife NFT; this is important because the NFTs 'mature' as they are transferred between wallets. After learning what these symbols mean, collectors and enthusiasts can quickly understand the Chainlife token's maturity state.
Below is a diagram of showing a general overview of a Chainlife token. Note that the color of the lines (pink-ish) is the third color of this Chainlife token's palette.