Hieroglyphs were a big deal to the Egyptians. Many of them carried great religious meaning, and some were used in standard tomb writings.
These are some of the more important ones.
This is an Ankh, it is the symbol of Eternal Life, and Power with the Egyptian culture. It is also called the "handled cross", or crux ansata. It represents the male triad and the female unit, under a decent form.
This is the Eye of Horus, it is a symbol of one of the houses of magic that Egyptians believed in. This symbol of for the House of Horus, the Falcon headed warrior god.
This is the symbol of peace, or rest. It is also often times put on tombs to help people's soul pass on without hindrances.
This is the symbol of Isfet. Which means Chaos. It is generally associated with curses within the house of magic, and is also generally associated with Apophis or Apep, the Chaos Serpent is wants to swallow the sun and destroy everything.
This is Was. This is a symbol of power and dominion. The Was scepter is carried by deities as a sign of their power. It is also seen being carried by kings.
This is the symbol of Ma'at. It stands for order, justice and is meant to counteract Isfet. Ancient Egyptians would mark themselves with this symbol because they believed it would keep them on the right path.