Definition of siglum in English:

siglum

Syllabification: sig·lum
Pronunciation: /ˈsiɡləm
 
/

noun (plural sigla /ˈsiɡlə/)

A letter (especially an initial) or other symbol used to denote a word in a book, especially to refer to a particular text.
More example sentences
  • The Wake's hybridist nature extends beyond genre, even beyond portmanteau words, indeed to the most atomic level of text (letters, punctuation, sigla of all forms).
  • The equal sign used here stands for a three-lined equal sign in the book, but my computer cannot produce such a siglum.

Origin

early 18th century: from late Latin sigla (plural), perhaps from singula, neuter plural of singulus 'single'.

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