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.
Review 101 words. Refresher.