After looking at the real tag usage my personal opinion is that there are some possible solution we could examine.
For first, it would be goof to correct all the questions mistaking the usage of the tag [modulus] with the meaning of [modulo].
Then it's possible to delete the [modulo] tag and choose another word or sentence which could be more clear for the final users. i.e. [modulo-abs-value] and [modulo-rest]. We can think about it..
It could also be really useful to handle disambiguation (as wikipedia is doing) with tags.
Modulus is a term used for absolute value in complex analysis, and also a term used for the thing-being-divided-by in remainder arithmetic (actually called modular arithmetic)