Is “Sigla” a Scrabble word?
Yes
SIGLA
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Sigla
noun
1.A letter or other symbol that stands for a word or name.