## helix sense

https://doi.org/10.1351/goldbook.H02771
The right-handed sense of a @H02769@ traces out a clockwise rotation moving away from the observer; the left-handed sense of a @H02769@ traces out a counterclockwise rotation moving away from the observer, e.g. the ...$$\mathrm{TG}^{+}$$ $$\mathrm{TG}^{+}$$ $$\mathrm{TG}^{+}$$ … @H02769@ of isotactic poly(propylene) is left-handed.
Source:
Purple Book, 1st ed., p. 43 [Terms] [Book]