“Pen” From Boyd’s Bible Dictionary:
(feather). Anciently, a metal graver for tracing on hard substances; the stylus, of pointed metal or bone, for writing in wax; the reed pen and hair pencil for writing on parchment and linen (Judg. 5:14; Job 19:24; Jer. 17:1).
“Reed” From Boyd’s Bible Dictionary:
(rod). Used generically for the tall grasses, sedges, flags, or rushes which grow in marshy soils. Applied to various uses by Hebrews, and source of frequent metaphor (2 Kings 18:21; Job 40:21; Isa. 19:6; Ezek. 29:6; Matt. 11:7; 12:20; 27:29).
“Pen” From Concise Bible Dictionary:
A general term for any implement used either for cutting an inscription on stone or metal, or a reed for writing on papyrus or parchment (Judg. 5:14; Job 19:24; Psa. 45:1; Isa. 8:1; Jer. 8:8; Jer. 17:1; 3 John 1:1,13).
“Reed” From Concise Bible Dictionary:
See WEIGHTS and MEASURES.
Strong’s Dictionary of Greek Words:
Meaning:
or uncertain affinity; a reed (the plant or its stem, or that of a similar plant); by implication, a pen