I mean two As beside each other/right next to each other.What do you mean by "two As"? There are many words containing two As, but maybe you mean something more specific, like two As right next to each other? Or are you talking about phonetics, as in Latin having two sorts of As with a slightly different sound?
I think Faliscans also, but I'd have to look around.[LAT]
Ita! Priſci quoque Itali, ut puta, Oſce loquentes, vocalium longitudinem indicabant per duplices litteras:
fluusaí - flōra < *flōsa
aasas - āra < *āsa
fíísnú - fānum < *fāsnom
Viínikiís - Vīnicius < *wīno-
trístaamentud - testāmentō - < Lat. *tristāmentom < *tri-sto-
Staatiis - Stātius < *?
Ancient Italians as well, e.g. Oscan language speakers, indicated long vowels by duplicating them.