Kerned Types
When the face of a letter is so large that it projects over the type-body, it is known as a kerned type. Letters of this kind are common in italic and script fonts, and there are a few letters, like f and j, in some oldstyle roman fonts which have the tip of the letter overhang. Kerned types are a source of trouble because of the ease with which these projections break off during composition, proofing, etc. Yet they cannot be entirely dispensed with, especially in italic and script faces having a definite slope, where the long letters would have wide gaps on the side (as shown in the script line above) if they were cast on bodies wide enough to hold the entire face. In some styles of upright faces having extra long descending letters g, p, q, y, these descenders may be kerned.
Modern type-makers try, by changing the shape of the letters slightly, to avoid kerns as much as possible, because of the extra care and expense involved in casting. Too often, unfortunately, this avoidance of the kern, in order to meet mechanical convenience, is secured by sacrificing the distinctive form of the letter.