What is "calibri"

Calibri is a humanist sans-serif typeface family designed by Lucas de Groot. In Microsoft Office 2007, it replaced Times New Roman as the default typeface in Word and replaced Arial as the default in PowerPoint, Excel, Outlook, and WordPad. It continues to be the default in Microsoft Office 2010, 2013 and 2016, and it is now the default font in Office for Mac 2016. A subtly rounded design, de Groot described it as having "a warm and soft character".

Calibri (Kah-Lee-Bree) is part of the ClearType Font Collection, a suite of fonts from various designers released with Windows Vista. All start with the letter C to reflect that they were designed to work well with Microsoft's ClearType text rendering system, a text rendering engine designed to make text clearer to read on LCD monitors. The other fonts in the same group are Cambria, Candara, Consolas, Constantia and Corbel.