Yes, signa is in the scrabble dictionary

...and is worth 8 points by itself.

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Signa Definition

noun

Plural of signum.
from The Century Dictionary and Cyclopedia

verb imperative

Write on label.
from Free Scrabble Dictionary

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Top Words by points

Points

signa

6

2 letter words with SIGNA

Points

ai

2

an

2

as

2

si

2

na

2

is

2

gi

3

in

2

ag

3

3 letter words with SIGNA

Points

san

3

sag

4

sig

4

nag

4

ins

3

sin

3

gis

4

gin

4

gas

4

gan

4

ani

3

ais

3

ain

3

ags

4

4 letter words with SIGNA

Points

sain

4

sang

5

sign

5

sing

5

snag

5

nags

5

gins

5

gain

5

anis

4

ains

4

agin

5

5 letter words with SIGNA

Points

signa

6

gains

6

Found 36 words in 0.14544 seconds