A carpet or rug was a flat textile used as a floor covering or wall ornament.
History and specifics
When observing the construction of the composite frigate Challenger, Nick Keller wondered to himself why the otherwise hurried shipwright work had been delayed for the addition of carpet. He remembered afterwards that carpet helped with acoustics, was treated with flame-retardant material to prevent open fires aboard ship, as well as providing footing and a safety factor in case of falls. As a so-called "Mongrel-class" vessel, Challenger in particular had several different varieties of carpet that had been scavenged from the various wrecked ship she was built from. On the bridge, the lower deck was carpeted with burgundy, while the quarterdeck and sci-deck had navy blue carpet taken from a completely different vessel. (TOS - New Earth novel: Challenger)