The name for this font family comes from the river running through the Italian city of Florence. The city itself is famous for renaissance architecture and with it the typography that became unique to the period. The 15th and 16th centuries were a time of great change and this was reflected in just about every aspect of life, including the printed word.
Robert Slimbach, long-term principal designer at Adobe when he developed Arno, was interested in making a modern font family that although had inherent features of the Renaissance era, would be modern enough to be functional. Slimbach paid close attention to detail as with all his designs and the resulting Arno font family has become a reflection of the way text was reproduced in traditional Venetian and Aldine Press books. In particular, Arno took influence from the early typeface named after Frenchman Jensen a renowned typesetter who worked mainly in Venice in the 15th century. He designed a specific typeface called Adobe Jensen® which embodied the Renaissance style of this printer.
The original renaissance typefaces were used to print mostly Latin so the design and kerning of letters was appropriate to that language. The Arno typeface is a modern version of this design so was kerned with European letter combinations and ligatures in mind. The outline of Arno is extremely crisp and somehow Slimbach has created a totally modernized version of these older typefaces without losing their heritage.
Metal foundry types as used in books of the renaissance do not digitize well, causing uprights to appear thin and out of proportion resulting in reduced legibility. The Arno typeface addresses this shortcoming and places a little more emphasis in the stroke widths of affected letters. The Arno font family is a very polished and perfect rendition of a Renaissance typeface retaining the flowing style, improving readability and with the added bonus of such a vast collection of styles, weights and widths within the Arno font family.