What characterizes fingerspelled loan signs?

Fingerspelled loan signs are characterized by resembling specific signs while being derived from fingerspelled words. These signs emerge when a fingerspelled word, often borrowed from another language, is adopted into a sign language, leading to a modification where the fingerspelling reflects a distinct sign form. Over time, certain fingerspelled words become so integrated into the language that they take on a specific shape or motion that are recognized as signs, merging the original spelling with sign language syntax and morphology.

The other choices do not accurately capture the essence of fingerspelled loan signs. For instance, while some signs may rarely be used or represent abstract concepts, these qualities do not define fingerspelled loan signs specifically. Additionally, words that are spelled out letter by letter would refer more to the act of fingerspelling itself rather than the transformation into a signed form.