non-standard positional numeral system
any positional numeral system that uses a base or digit set differently from standard positional systems
balanced ternary
numeral system that uses the digits −1, 0, and 1
golden ratio base
positional numeral system
complex-base system
non-standard positional numeral system using a complex number as radix
signed-digit representation
positional numeral system with signed digits; the representation may not be unique
negative base
non-standard positional numeral system
mixed radix numerical system
positional numeral system in which positions have different numerical bases