(typography) the ban on separating multiple successive digits during line breaking

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)

unnecessary

needlessness

necessary evil

健夫: a male given name / 建夫: a male given name

縦横, 経緯: length and breadth; warp and woof

縦笛, 竪笛: vertical flute; recorder (musical instrument)

to scratch with the hand in a claw position

to stand, to place in an upright position / to release something physical but not solid or liquid / (Internet slang) to start (a thread)