Thunderbolt........what comes to my recollection. Tough, reliable, and it would get you home after a 'tangle' with the enemy. But we's talkin' coins, so pardon an old mans recollection of past history. Recent past.......not quite as old as you ancient fellows.
Here's a thunderbolt that hasn't made an appearance yet: Antoninus Pius, 138-161, denarius, Rome, 145-161 Obv: ANTONINVS AVG PIVS P P, laureate head of Antoninus Pius to right Rev: COS IIII, thunderbolt on draped throne Ref: RIC 137
That is a very nice example; I haven't seen very many of these. I have one as well, not so nice: Roman Imperatorial Denarius Octavian / Q Salvius, moneyer (40 B.C.) Military Mint in Italy C CAESA[R III] VR R P C, bare head of Octavian right / Q SALVVS IMP COS D[ESIG], around thunderbolt. Crawford 523/1a; Sydenham 1326b. (3.58 grams / 18 mm)
a thunderbolt and dolphin aes grave note, most cast coins have a medal turn, or the top of the obv & rev point to 12 oclock. For this coin to be medal turn, the dolphin is jumping out of the water. More likely, both the fish and t'bolt are horizontal and the 4 dots are at right angles.
@Terence Cheesman showed an Antoninus Pius AE with a thunderbolt design. Here is a denarius: Denarius. 18 mm. 3.08 grams. PROVIDENTIAE DEORVM Thunderbolt Laureate head right. ANTONINVS AVG PI-VS PP TRP COS III RIC 80, struck "140-143" Sear II 4103
Divus Augustus AE As AD 34-37. Struck under Tiberius. DIVVS AVGVSTVS PATER Radiate head of Augustus left. S – C to left and right of upright winged thunderbolt. BMCRE 158; C. 249; RIC 83.