Help, Unicode symbols

[sandraboo]

On my forum the unicode symbols
£¢²³±¥µ¦¶§©¹ºª«»¼¬½¾®¯¿

show as

ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿ ½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½

Could someone please help?