Aes grave ("heavy bronze") is a term in numismatics indicating bronze cast coins used in central Italy during the 3rd century BC, whose value was generally indicated by signs: I for the as, S for semis and pellets for unciae. Standard weights for the as were 272, 327, or 341 grams, depending upon the issuing authority.[1]
The main Roman cast coins had these marks and images:
| Image | value | mark |
|---|---|---|
| Ianus | As | I |
| Iupiter | Semis | S |
| Minerva | Triens | four pellets |
| Hercules | Quadrans | three pellets |
| Mercury | Sextans | two pellets |
| Bellona or Roma | Uncia | one pellet |