A stickpin is a piece of jewellery: a long straight pin with a decoration — often a pearl, a small jewel, or a shaped piece of gold — on the top end. You push it through cloth so only the pretty head shows. Traditionally it was worn in a man's necktie or cravat, which is why it is also called a tiepin or a tie tack, and it held the tie neatly in place while looking good. It can also be worn on a coat lapel or a hat. The word is a noun. It is written as one word in American English (stickpin); British English more often just says tiepin. This is an old-fashioned thing, so the word appears mostly in stories set in the past, in descriptions of formal old-style clothing, and in antique shops. If a modern man wears something on his tie today it is usually a tie clip — a flat metal bar that grips, not a pin that goes through.

領帶針、飾針（別在領帶或衣領上，頭上有珠寶裝飾的那種長針）