At Camp Jupiter, the campers get permanent tattoos for every year they've been at camp or quest they've completed, similar to the Camp Necklace beads at Camp Half-Blood. The tattoos have lines on them that are similar to a bar code which symbolizes the marks of honor given to Roman soldiers after every battle. The tattoos do not wear off because they they are burned on the legion member's skin. Along with the lines, the god from which the family had descended from is included with the god's symbol.
SPQR stands for Senatus Populusque Romanus. The meaning of it is as follows: The Senate and People of Rome. It was used as an official signature of the government, such as on coins, documents, statues, or dedications and also the standards.
- Children and legacies of Jupiter are marked with an eagle.
- Children and legacies of Neptune are marked with a trident.
- Children and legacies of Apollo are marked with a lyre.
- Children and legacies of Mars are marked with two crossed spears.
- Children and legacies of Bellona are marked with a crossed sword and torch.
- Children and legacies of Pluto are marked with a black glyph like a cross with curved arms and a "head."
When a camper at Camp Jupiter is no longer on probatio and is accepted into the legion, they are branded with the initials SPQR, the symbol of their godly parent, or ancestor (if they are a legacy, like Octavian) and lines underneath, showing their years of service to the Legion.