Is “Signary” a Scrabble word?
Yes
SIGNARY
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 Signary
/ˈsɪɡ.nə.ɹi/
noun
1.The set of characters in a writing system: alphabet, syllabary, etc.