What does ‘HT/FT or Half Time / Full Time’ mean?

This type of betting has you predict which team the first half and which the second.
 
Example: Club Brugge - Anderlecht
Half time score: 0-0, end score: 1-0 the correct bet was in this case X/1. X: draw at half time, 1: Club Brugge wins the second half.
Halftime score 1-0, end score 2-2 the correct bet was in this case 1 / 2. 1: Club Brugge was ahead by 1-0 at half time. Anderlecht won the second half with 1-2. Making the end score 2-2.