Hai ragione...ho trovato questo girovagando per Internet:

Ciao Alex
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TaylorMichaelLMVP, Moderator - Posted on martedì 29 agosto 2006 15.13.55

The hand icon was added to mimic the standard Win32 constants allowed by the API. However the hand icon in Windows is from the Win3.x days and maps to the stop sign in all current versions of Windows. For closure here is the summary:

Exclamation, Warning = Exclamation point
Information, Asterisk = Lower-case i
Question = Question mark
Stop, Error, Hand = Stop sign

In your case I'd recommend the Information value.

Michael Taylor - 8/29/06