also: はじっこ
I sat in a seat at the end of the train car.
It's on the edge of the desk.
I like the crust (end piece) of bread.
I like the crusty end pieces of bread.
I cut off the end of the fish and threw it away.
先端 is a formal, technical word for the very tip or forefront of something, whereas 端っこ is casual and everyday.
真ん中 means the middle or center, the direct opposite of 端っこ which means the end or edge.
Standard kanji-kana spelling; the reading はしっこ is the most common.
Alternate pronunciation; common in colloquial speech.
Kana spelling, often used in casual writing or when avoiding kanji.
Derived from 端 (はし, 'end') with the diminutive suffix っこ, which adds a casual or affectionate tone. The alternate reading はじっこ comes from a voiced variant of the same root.