Strong's Greek #5481 - χαρακτήρ, ῆρος, ὁ charaktér (a tool for engraving)

exact representation, exact likeness

From the same as charax; a graver (the tool or the person), i.e. (by implication) engraving (("character"), the figure stamped, i.e. An exact copy or (figuratively) representation) -- express image.

see GREEK charax

Strong's 5481: χαρακτήρ

χαρακτήρ, χαρακτηρος, ὁ (χαράσσω to engrave, cut into), from Aeschylus and Herodotus down;

1. properly, the instrument used in engraving or carving (cf. ζωστήρ, λαμπτήρ, λουτήρ, φυσητήρ; cf. our 'stamp' or 'die').

2. the mark (figure or letters) stamped upon that instrument or wrought out on it; hence, universally, "a mark or figure burned in (Leviticus 13:28) or stamped on, an impression; the exact expression (the image) of any person or thing, marked likeness, precise reproduction in every respect" (cf. facsimile): χαρακτήρ τῆς ὑποστάσεως τοῦ Θεοῦ, of Christ, accusative to his nature as ὁ θεῖος λόγος, Hebrews 1:3; σφραγῖδι Θεοῦ, ἧς ὁ χαρακτήρ ἐστιν ὁ ἀΐδιος λόγος, Philo de plant. Noë § 5; χαρακτήρ θείας δυνάμεως, of the human mind, Philo, quod det. potiori ins. § 23; God τόν ἄνθρωπον ἔπλασεν τῆς ἑαυτοῦ ἐκονος χαρακτῆρα, Clement of Rome, 1 Cor. 33, 4 [ET]; οἱ πιστοί ἐν ἀγάπη χαρακτῆρα Θεοῦ πατρός διά Ἰησοῦ Χριστοῦ (ἔχουσιν), Ignatius ad Magnes. 5, 2 [ET]. the peculiarity, by which things are recognized and distinguished from each other (cf. English characteristic): 2 Macc. 4:10.

Strong's Greek: 5481. χαρακτήρ (charaktér) — 1 Occurrence

Hebrews 1:3 - N-NMS
GRK: δόξης καὶ χαρακτὴρ τῆς ὑποστάσεως
NAS: of His glory and the exact representation of His nature,
KJV: and the express image of his
INT: glory and [the] exact expression of the substance