NL10 flop check up

[Mr_Pathetic]

what does this line represent against someone who is unknown

Poker Stars - No Limit Hold'em Cash Game - $0.05/$0.10 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $5.55
BB: $9.90
UTG: $4.20
Hero (CO): $10.20
BTN: $31.45

Preflop: Hero is dealt A T (5 Players)
UTG calls $0.10, <font color="red">Hero raises to $0.50</font>, BTN folds, SB calls $0.45, 2 folds

Flop: ($1.20) A[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/heart.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $0.80</font>, <font color="red">SB raises to $2.00</font>, Hero??