This is the 6810th most frequent Japanese word.
フットロング
"フットロング" (futtorongu) refers to a foot-long sandwich, typically 12 inches in length.
フットロング is used here to describe the size of the sandwich, specifically a 'footlong' referring to its length as a unit of measurement.
私はお昼にフットロングのサンドイッチを食べました。
I had a footlong sandwich for lunch.
フットロング is used metaphorically here to describe the size of the banner, implying a long dimension akin to 'footlong'.
そのフットロングの看板が見やすい場所に設置されました。
The footlong banner was placed in a visible location.
フットロング is used as part of the store's branding, likely suggesting that it specializes in sandwiches or products described as 'footlong' in size.