From iyt (contracted) in the sense of swooping, i.e. Side-long stroke; a stylus or marking stick -- pen.
see HEBREW iyt
H5842. et
עֵט noun masculineJeremiah 8:8 stylus (√ dubious; Köii. 1, 83 (after older authorities) compare Arabic , sink, penerate); — ׳ע only construct:
1 of iron, for use on stone or metal Jeremiah 17:1 (שָׁמִיר בְּצִמֹּרֶן with diamond-point), Job 19:24 (see also חֶרֶט).
2 probably = reed-pen (used o roll, compare Jeremiah 36:2, 23 etc.), ׳ע סֹפְרִים שֶׁקֶר 8:8, figurative, ע ׳לְשׁוֺנִי מָהִיר סוֺפֵר Psalm 45:1 (compare NowArchaeology i. 290 BenzArchaeology 290).