TYPOGRAPHYThe art and technique of printing withmovable type.The composition of printed material frommovable type.The arrangement and appearance ofprinted matter.early 17th century: from Frenchtypographie or modern Latin typographia
LEADINGIn typography, leading refers to thedistance between the baselines ofsuccessive lines of type. The termoriginated in the days ofhand-typesetting, when thin strips oflead were inserted into the formes toincrease the vertical distance betweenlines of type.
EMem is from M. Originally the unit wasderived from the width of the capital "M"in the given typeface. This unit is the samefor all fonts at a given point size.In CSS, using a relative unit ofmeasurement (such as the emmeasurement), rather than aﬁxed one such as pixels ("px") or points.
Helvetica is a widelyused sans-seriftypeface developedin 1957 by Swisstypeface designerMax Miedinger withEduard Hoﬀmann.
JOHNSTONJohnston (or Johnston Sans) is a humanist sans-serif typefacedesigned by and named after Edward Johnston. It is well known forits use by Transport for London.Johnstons former student Eric Gill also worked on the developmentof the typeface, which was later to inﬂuence his own Gill Sanstypeface, produced 1928–32.