Isaiah 6:2 Seraphim stood above Him, each having six wings: with two he covered his face, and with two he covered his feet, and with two he flew.
This passage is one of the better verses in the Bible to physically describe what a seraph looks like. The Hebrew word is seraph. Seraphim is the plural form of the word. According to Strong’s Concordance, the word isdefined asserpent, fiery serpent, poisonous serpent (fiery from burning effect of poison). The word literally means burning one.
There are other terms for angels in the Bible. They include: sons of God, holy ones, morning stars, cherubim, ministering spirits, and watchers.
The creature has six wings. One interesting note is the part of the verse in reference to covering his feet. Some scholars have suggested this is an idiomatic reference to genitals. Revelation 4 does mention creatures with six wings in the throne room of Heaven. Revelation 4:8 And the four living creatures, each one of them having six wings, are full of eyes around and within. Previous verses in Revelation indicate the faces of the creatures are different from each other.
The word seraph can also be translated as a poisonous snake. See Numbers 21:6 The LORD sent fiery serpents (seraph) among the people and they bit the people, so that many people of Israel died. A second example is Deuteronomy 8:15. “He led you through the great and terrible wilderness, with its fiery serpents (seraph) and scorpions and thirsty ground where there was no water; He brought water for you out of the rock of flint.
In Isaiah 14:29, seraph is translated as a flying snake. “Do not rejoice, O Philistia, all of you, because the rod that struck you is broken; for from the serpent’s root a viper will come out, and its fruit will be a flying serpent (seraph).
The Hebrew word for angel is malak in the Old Testament. Malak defined means: messenger, representative, angel, the theophanic angel or the Angel of the Lord.
The Greek word for angel is aggelos in the New Testament. Aggelos defined means: a messenger, envoy, one who is sent, an angel, a messenger from God.