Today I saw an amsart article with the following script "I" in it:

But I can't identify which font it is. All math script fonts I know are \mathcal, \mathscr, and \mathfrak, but none of these match. Could anyone help me? Thanks.
Today I saw an amsart article with the following script "I" in it:

But I can't identify which font it is. All math script fonts I know are \mathcal, \mathscr, and \mathfrak, but none of these match. Could anyone help me? Thanks.
$\Im$, which is in the standard fonts. – egreg May 19 '13 at 16:00