⚫️⃝

#inside #within #surrounded #containment #shape in shape

▲○

#shape in shape #black triangle

🔲⚪️

#square contains circle #shape in shape #geometric shapes #containment #black square white circle

🔺⃝

#shape in shape #combining character #unicode symbol #enclosed triangle

🟥🔴

#square and circle #shape in shape

🟢🔷

#blue diamond in green circle #shape in shape #blue in green #contained shape

□◇□

#diamond in square symbol #geometric diamond square #unicode diamond square #shape in shape #contained shape #white diamond in white square