Meaning: The present day; on, during, or for this day.
Pronunciation (production): Two-handed "Y" (handshape), palms up (orientation), moves downward twice (movement) in space (location).
Related signs: NOW, JUST NOW, NOWADAYS, FROM NOW ON, HERE AND NOW, UP TO NOW.
Opposite: TOMORROW and YESTERDAY.
This old, now-obsolete ASL word is a compound word glossed as NOW+DAY. Not to mention, the English word "today" appears to be a compound word ("to"+"day") as well. These days, this sign had evolved to the sign as shown in the first video above.
First 100 words.
As you feel more comfortable with the first few hundreds of ASL signs, progress further with your vocabulary and learn signing more.