略語大辞典 [E] 25 IKL isokeraunic level 年間雷雨日数. 送電線雷害事故率と相関関係がある. 送電線の耐雷設計の指標の一つ.isokeraunic level; annual days of thunder-shower; correlates with the thunderbolt accidents of electrical transmission lines; [E:Geo]. 丸善「略語大辞典」JLogosID : 11878373