The 13w43a snapshot that came out today had a fix for the alt codes crashing the game but now some of the characters look as if they were bold.
1st picture = Minecraft 13w42a (Normal)
2nd picture = Minecraft 13w43a (The n & the square appears bold)
3rd picture = Even the splash looks bold
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Sorry, I forgot to mention the command I used.
This can only be done using a command block because the command is too long to fit in chat.
/setblock ~0 ~1 ~0 minecraft:wall_sign 2 replace {Text1:"<>===========<>",Text2:"POWER",Text3:"ᵒᶠᶠ □■ ᵒⁿ",Text4:"<>===========<>"}In the command itself there is already a "bold" n , so it's not a matter of the sign, it's a matter of the font or the character itself.
/setblock ~0 ~1 ~0 minecraft:wall_sign 2 replace {Text1:"<>===========<>",Text2:"POWER",Text3:"ᵒᶠᶠ □■ ᵒⁿ",Text4:"<>===========<>"}/setblock ~0 ~1 ~0 minecraft:wall_sign 2 replace {Text1:"<>===========<>",Text2:"POWER",Text3:"on □■ on",Text4:"<>===========<>"}Both of these command works, looks, and acts as intended in 13w48b and 1.7.2
You can see the first one (which is what the OP posted) contains the non-normal text in the command itself, thus it was put on the sign. When retyped everything looks normal.
Cannot confirm.
You must have put some special characters on the sign.