横隊 is read as おうたい (outai) and means rank.
おうたい
outai
よこづな
yokozuna (highest rank in sumo)
おうけつ
tunnel tomb (Kofun period)
おうへい
arrogant
おうだんまく
horizontal banner
よこちょう
bystreet
よこすべり
sliding sideways down a slope
よこじく
horizontal scroll
よこはま
Yokohama (city)
よこてんかい
horizontal deployment (of techniques, etc.)
よこはまこくりつだいがく
Yokohama National University
よこはましりつだいがく
Yokohama City University
よこづなしんぎいいんかい
Yokozuna Deliberation Committee