Icons
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We host a collection of icons commonly found in software architecture diagrams for free to help you get started: https://icons.terrastruct.com.
Icons and images are an essential part of production-ready diagrams.
You can use any URL as value.
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Using the D2 CLI locally? You can specify local images like icon: ./my_cat.png.
Icon placement is automatic. Considerations vary depending on layout engine, but things like coexistence with a label and whether it's a container generally affect where the icon is placed to not obstruct. Notice how the following diagram has container icons in the top-left and non-container icons in the center.
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Icons can be positioned with the near keyword introduced later.