Which tool is described as a board of fine, upright nails used for combing through human hair?

The tool referred to in the question is the hackle, which is specifically designed for combing through human hair. A hackle consists of a board with fine, upright nails that effectively separate and detangle hair fibers. This tool is commonly used in the context of working with human hair extensions or creating wigs, as it allows for precise manipulation and gentle handling of the hair without causing damage.

The hackle's design enables it to effectively remove tangles while maintaining the integrity of the hair strands. This makes it a crucial tool in the natural hair care practice, particularly for professionals who deal with styling and preparing hair for various looks.

In contrast, other options like the drawing board or curved needle serve entirely different purposes. The drawing board is typically used for artistic purposes, while the curved needle is utilized in sewing or stitching applications. A finishing comb, while useful in styling, does not possess the features that allow for the detangling specifically described in the question. Therefore, the hackle stands out as the most appropriate answer due to its unique design and function tailored for handling human hair.