A narthex is a room in a church where long ago, those who wished to attend service but where not yet baptized could observe from. Thus, to this day, many narthexs still feature windows that open to the sanctuary. Nowadays, narthexs are simply greeting halls.
Things you didn't Know #2
Many churches feature exposed beams and "cathedral" ceilings to draw the eye upwards, as if to God. The beams and steep pitch serve another purpose however; to remind congregants of Noah's arc and how now, as then, the church functions as a sort of boat to save a sinking world.
Things you didn't Know #3
While seldom thought of as more than seating, pews are full of symbolism. For one, pews visually remind a person of oarsman seating on a ship...once more calling to mind the church as a sort of life boat. Additionally, pews are intentionally made from great quantities of wood; this done to remind one of the tree of life as spoken of in scripture, and to also call to mind the cross.
Things you didn't Know #4
Prayer benches/kneelers are uncommon in Presbyterian churches, but have become a fixture in American Christianity. First popularized by 19th century revivalist and ordained Presbyterian(ish) minister Charles Finney, "anxious benches" were, and are, used during prayers of repentance and "altar calls"...special periods of services when unconverted hearts are encouraged to come forward and confess their need for, and faith in, Christ. They are also infrequently used in special ceremonies such as commissionings and marriages.
Things you didn't Know #5
The Baptismal font is the means by which a person enters the church. While methods of baptism vary, a typical baptismal in the Presbyterian church features 8 sides to recall the old covenant of circumcision; done on the 8th day. As circumcision signified one was a member of God's promise in the Old Testament, Baptism signifies one is a member of God's new promise of salvation by faith in Christ.
Things you didn't Know #6
The Lord's Table is at the center rear of the sanctuary, as it is the symbolic "center" of a service. Despite visual similarities, the Lord's Table is not in fact an altar; altar's traditionally have a storage space in the base for relics, and do not have a top which overhangs the base. Tables are favored in the Presbyterian tradition as they more concretely remind us of the Last Supper and the ordinance of Communion. Communion is a sacred meal that unites all believers (the church) at the Table of God. 2 candles are kept on the Table to remind of the 2 natures of Christ, human and divine. The flame atop each candle calls to mind the flame of the holy spirit which blazes within the hearts of the faithful. On the front of our Table, are carved the letters "IHS". These represent the Greek letters iota-eta-sigma; the first 3 letters of Jesus' name in Greek.