The present day; on, during, or for this day.
This old ASL word is a compound word "now"+"day". Not to mention, the English word "today" appears to be a compound word ("to"+"day") as well.
Lately these days, this sign has evolved to "NOW+NOW".
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.