What does Bash operator <<< mean?
LINE="7.6.5.4"
IFS=. read -a ARRAY <<< "$LINE"
echo "$IFS"
echo "${ARRAY[@]}"

<<<word

$ cat /tmp/ifs.sh
LINE="7.6.5.4"
IFS='.'  read -a ARRAY <<< "$LINE"
echo "$IFS"
echo "${ARRAY[@]}"

$ bash /tmp/ifs.sh


7 6 5 4

$ cat /tmp/ifs.sh
LINE="7.6.5.4"
IFS='.';  read -a ARRAY <<< "$LINE"
echo "$IFS"
echo "${ARRAY[@]}"

$ bash /tmp/ifs.sh
.
7 6 5 4