Serif is a short line or last stroke that crosses or projects from stems or strokes in a serif character. Serifs have a lot of shapes, including bracketed, hairline, wedge and slab.
slug is in mechanical metal typesetting. It is a line of slug type cast as a unit.
specimen is another sample of font type. It conventionally used by type manufacturers to publicize their typefaces and by printers, graphic designers and compositors, for your reference.
A Spine is the main stroke of the letter s.
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