Hello list, I continue to work with the \unit command, and found some behavior very surprising. When I try to register units with capital letter names, it breaks lowercase metric prefixes. For example, registering C=coulomb, K=kelvin and N=newton breaks metric units cm, kg, and ns. The file below demonstrates the behavior. Obviously, I can use full names in my document. However, I would like the standard SI symbols, which are single capital letters, to work for me and my less TeX-savvy colaborators. Thanks! Gavin \starttext Units does not completely ignore case. \startformula \unit{3 meter} \qquad \unit{6 Meter} \qquad \unit{3 mEtEr} \qquad \stopformula Units with lowercase prefixes (c, k, n). \startformula \unit{3cm} \qquad \unit{6kg} \qquad \unit{3ns} \qquad \stopformula Units with capital letters, called with names (coulomb, kelvin, newton). \startformula \unit{3 coulomb} \qquad \unit{6 kelvin} \qquad \unit{3 newton} \qquad \stopformula Units with capital letters, called with the capital letter (C, K, N) fail. \startformula \unit{3 C} \qquad \unit{6 K} \qquad \unit{3 N} \qquad \stopformula Now I register some units with capital letter names: C=coulomb, K=kelvin, N=newton. \registerunit[unit][ C=coulomb, K=kelvin, N=newton] Units called by capital letter (C, K, N) now work. \startformula \unit{3 C} \qquad \unit{6 K} \qquad \unit{3 N} \qquad \stopformula However, units with lowercase prefixes (c, k, n) are broken. \startformula \unit{3cm} \qquad \unit{6kg} \qquad \unit{3ns} \qquad \stopformula \stoptext