What does the junction box drawing BOT EL mean in English?

box British [b?ks] American [bɑ:ks]

n. box; box-like object; box; outpost;

vt. …Put it into a box [box, box];

vt. Boxing;

[Example] He reached into the cardboard box beside him

He reached out his hand Into the cardboard box next to you.

[Others] Third person singular: boxes Plural: boxes Present participle: boxing Past tense: boxed Past participle: boxed