In Microsoft Word you can use Equation Editor to insert math equations. The font used in the editor is shown as Cambria Math. I found there is a difference between italic version of the font in the editor and those out of the editor, as shown in the following picture (The first row is the alphabets in the editor and the second row is those out of the editor:
However the normal version (non-italic) of the font shows no difference:
I what to know what's the cause for the difference. Thanks.
In response Matthew Strawbridge's answer:
I checked my font folder and there is only Cambria Math Regular there. There are 4 versions for the Cambria font though. So I make a new observation. In the image below from top to bottom there are: Cambria, Cambria Italic, Cambria Math Italic in Equation Editor, Cambria Math, Cambria Math Italic.
It seems the alphabet font in Cambria and Cambra Math are the same. Since Cambra Math doesn't have a italic version, so there is a sloped Roman one. However what makes me confused is that the third row (Cambria Math Italic in Equation Editor) doesn't look like any other row, so I really wonder which font is used instead.