I can give you several sentences.
No, the finger spelled alphabet does not have capitalized versions of the letters.
Example sentence - The road sign gave the mileage to the next three cities.
Use it as a verb, "He squinted at the sign."
Give me a sign that you like me.Deaf people communicate with sign language.The sign needed to be replaced.
No, "sign language" is not typically capitalized in a sentence unless it is part of a title or at the beginning of a sentence.
Will will sign the will.
yes you can, eg I like to sign cards.
He gave me a sign to come over.I will sign to her.You need to sign this paper.
No, the finger spelled alphabet does not have capitalized versions of the letters.
Example sentence - The road sign gave the mileage to the next three cities.
The bus paused momentarily at the stop sign.
Please sign this treaty.
The octagonal shaped sign was colorful.
Yield to stop sign.
Example sentence - My brothers sun sign is Libra and mine is Aquarius.
That depends on the definition of the word "on" that you want. Resubmit your question with a sentence using "on".
The sign on the gate read "Trespassers Will Be Shot".