keychain pendant 3d model

A simple flat circular keychain pendant, single-sided relief design. Front face: a bold pi symbol (π) merged with a minimalist atom icon (small central nucleus with 2-3 thin elliptical orbit rings crossing through the pi symbol), raised embossed relief, minimalist geometric style, low detail. Back face: completely flat, smooth, blank surface with no pattern or texture, reserved for engraved text. Single flat disc shape, uniform thick walls, no thin fragile parts, no overhangs, smooth rounded edges. Small circular hole at the top of the disc for a keyring. 3D printable, watertight solid mesh, symmetrical, centered, low poly count, single-sided relief only, one flat side and one embossed side.