noun
odd piece; incomplete set; odds and ends
Refers to leftover, mismatched, or incomplete items, often from a set or collection. Can be used for physical objects or abstractly for something that doesn't fit in.
この皿は半端物で、セットの残りです。
This plate is an odd piece, left over from a set.
引き出しの中は半端物ばかりだ。
The drawer is full of odds and ends.
端物 refers to remnants or leftover pieces, often of cloth or paper. 半端物 emphasizes the incomplete or mismatched nature more strongly.
Compound of 半端 (はんぱ, 'incomplete, fragmentary') + 物 (もの, 'thing'). The exact historical derivation is uncertain, but the meaning is transparent from its components.