T is the abbreviation of tier, which stands for rank. T 1 and t2 are grade 1 and grade 2.

For example:

For example, the prefix "Empire" (with the attribute of 65-74% physical damage+100- 134 point hit) and "dictator's" (with the attribute of 75-79% physical damage+135- 169 point hit) on weapons.

Explanation of other terms in The Road to Exile;

White clothes are equipment without attachments. Blue clothes have at most 2 ornaments, yellow clothes have at most 6 ornaments (yellow jewelry has at most 4 ornaments). For dropped equipment, the blue suit should have at least 1 pin, and the yellow suit should have at least 4 pins (yellow jewelry should have at least 3 pins). Blue clothes can have two affixes, at most one prefix and one suffix. The yellow suit can only have three front (back) affixes at most, and the front suffixes add up to six.