Since regularity is the most well known of these, spaces that are both normal and R 0 are typically called "normal regular spaces" by people that wish to avoid the "R" notation.
Since regularity is the most well known of these, spaces that are both normal and R 0 are typically called "normal regular spaces". In a somewhat similar fashion, T 4 spaces are often called "normal Hausdorff spaces" by people that wish to avoid the "T" notation.