井綱 is read as いづな (izuna) and means well rope.
いづな
izuna
いどづな
well rope
いど
water well
い
well
いどみず
well water
いどばたかいぎ
content-free chat
いどほり
well digging
いづつ
family crest design based on a square wooden well curb
せいすい
せい
Chinese "Well" constellation (one of the 28 mansions)
いどがわ
well curb
いもり
newt (esp. the Japanese fire belly newt, Cynops pyrrhogaster)
いどぐるま
well pulley