C210 PLT EXPERIENCES A HDG DEV ON DEP FROM PIE.

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WE WERE DEPARTING ON AN IFR FLT TO DESTIN (DTS). OUR FLT PLAN WAS CLRED AS FILED (PIE HEVVN DIRECT DTS); DEPART RWY 35R; FLY RWY HDG AND CLB AND MAINTAIN 1600 FT; EXPECT 10000 FT IN 10 MINS; AND CONTACT TAMPA DEP ON 125.3; XPONDER CODE XXXX. AFTER CLRED FOR TKOF BY THE TWR; WE WERE HANDED OFF TO DEP. WE RPTED CLBING THROUGH 700 FT FOR 1600 FT. DEP STATED RADAR CONTACT AND INSTRUCTED US TO TURN L TO 80 DEGS AND CLB AND MAINTAIN 4000 FT. THE INFLECTION IN HIS VOICE GAVE A PAUSE AS TO SOUND AS IF WE WERE TO TURN L TO A HDG OF 080 DEGS. MY WIFE WAS READING BACK ON THE RADIO; REPEATED THE INSTRUCTIONS EXACTLY AS WE BOTH HEARD THEM; BUT WE WERE UNABLE TO RECEIVE IMMEDIATE REPLY OR CONFIRMATION DUE TO HVY TFC ON THE RADIO. WHILE PUZZLED; I COMPLIED AS EXACTLY AS POSSIBLE WITH A CLBING L TURN. AFTER PASSING THROUGH THE ACTUAL ASSIGNED HDG; THE CTLR CAME BACK AND ASKED WHAT WAS I DOING; DID I NOT HEAR HIS DIRECTION TO 'FLY HDG 280 DEGS?' MY WIFE; ALSO A PLT; AND I CONCURRED TOGETHER AND SHE STATED BACK TO HIM CLRLY THAT; 'SIR; I HEARD YOU TO STATE 'L TURN TO 80' AND WE COMPLIED.' WE WERE THEN GIVEN DIRECTIONS TO COME AROUND IN A TIGHT TURN BACK TO THE HDG 280 DEGS AND TO PROCEED. WE COMPLIED IMMEDIATELY AND FOLLOWED ALL INSTRUCTIONS. IN CONCLUSION; I BELIEVE THIS MISUNDERSTANDING WOULD NOT HAVE HAPPENED IF THE CTLR HAD USED STANDARD CTLR PHRASEOLOGY 'TURN L HDG 280 DEGS;' INSTEAD OF 'TURN L 280' WHICH COULD ALSO BE INTERPED AS 'TURN LEFT TO 80 (EIGHT ZERO).'