TalentsA point you spend in one of three class trees every level from 10. Rows unlock as you spend more; the 31-point talent at the bottom defines the spec.“Put your first five talents in Cruelty.” Full entry →?Talent points in each tree: 0 Discipline, 0 Holy, 0 Shadow. The tree with the most points is your spec. 0/0/0
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Gear?The average item level of what you have equipped. A quick 'how geared am I' number.
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average item level · 0/17 slots
DamageDamage per second, and by extension the damage-dealing role and the people playing it.“We're at 3 DPS, need a tank and a healer.” Full entry → in
dungeonsA five-player instance. Pre-raid gear comes from here.“Scholomance, Stratholme and the Blackrock dungeons are the endgame dungeons at 60.” Full entry → and
raidsA large-group instance — 20 or 40 players in vanilla — and the group itself. Weekly lockouts, big bosses, epic loot.“Raid is Tuesday and Thursday, be on by seven.” Full entry → 
Priest Talent Calculator