carpet tile
US /ˈkɑːr.pɪt ˌtaɪl/
UK /ˈkɑːr.pɪt ˌtaɪl/

1.
a square of carpet that can be laid on a floor alongside other such squares to form a carpet
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We decided to use carpet tiles for the office flooring because they are easy to replace.
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Installing carpet tiles can be a DIY project.