Is my database secure? / What does “=Tc/postgres” allow?

Given the following…

iproductiondb  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =Tc/postgres                 +                |          |          |             |             | postgres=CTc/postgres        +                |          |          |             |             | iproduction=CTc/postgres 

Are the postgres and iproduction roles the only roles that have any type of access to iproductiondb ?

=Tc/postgres is making me wonder if I need to fix something?