Question

Question #24999

Answer 1

Yes. We often see D(+) and L(-) written.

Explanation:

They mean the same respectively. D = "dextro", or right-turning, also considered the positive (+) direction. L = "levo" or left-turning, considered the negative (-) directions.

Why they both remain in (often) simultaneous use I do not know. But "D" is always (+) and never negative, and "L" is always (-) and never positive.

See also:
https://socratic.org/questions/what-is-the-structure-of-l-glucose-and-l-glucose-can-you-explain-in-a-simple-way

and:
http://www.differencebetween.com/difference-between-d-and-vs-l-glucose/