The person who had administered the three lines is merely trying to add emphasis to the word, drawing your attention to it.
Eg. A teacher might be correcting a mistake made in a report, such as getting an answer wrong or spelling a word incorrectly.
Albatross
to take out of =) <3
woe
God is with us <3
sad
"I was under 3"
Usually addition. 4 and 3 = 4 + 3
Such as hub, do you mean?
Eat
Tad
Three, such as tricycles have 3 wheels.
Bit.