⬜💨∅

#empty square #void square #nothing square #zero content #clear square

🟥🕳️

#red square hole #empty square #void square #missing middle #punctured square

⬛️⬛️

#black black #double black #two black squares #block black #solid black #void square

🔲or🔲💨

#empty frame #vacant square #void square #nothing square #hollow square