pedagogical (adj.)

"of or pertaining to a teacher of children," 1781, from Latin paedagogicus, from Greek paidagōgikos "suitable for a teacher," from paidagōgos "teacher of children" (see pedagogue). Earlier (1755) in reference to the points used in printing Hebrew and Greek letters.

Lastly, we observe, that Hebrew being a Sacred language, is chiefly studied by Divines, who often make use of Points in Theological writings; tho' plain Hebrew as well as Greek, are understood and very frequently printed without Points or Accents. But that the use of such Pedagogic Symbols will one time cease, is the hope of all that delight in beholding neat Letter disrobed of all intruders upon its native beauty. [John Smith, "The Printer's Grammar," London, 1755]

suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).