Typeface
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A typeface is a design of letters, numbers and other symbols, to be used in printing or for electronic display. Most typefaces include variations in size, weight, slope, width, and so on. Each of these variations of the typeface is a font.
A Specimen, a broadsheet with examples of typefaces and fonts available. Printed by William Caslon, letter founder; from the 1728 Cyclopædia.
London Underground's Johnston typeface, printed on a large sign
Specimens of printed floral borders from an 1897 type foundry specimen book.
Letter (alphabet)
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In a writing system, a letter is a grapheme that generally corresponds to a phoneme—the smallest functional unit of speech—though there is rarely total one-to-one correspondence between the two. An alphabet is a writing system that uses letters.
Ancient inscription on a vase featuring Greek letters
The American manual alphabet, an example of letters in fingerspelling
Engravings of decorated Latin letters, from the 18th century (note the lack of a J and a U)
Image: Decorated Roman alphabet MET DP855610