Question
Why is the candle used to end the shabath is braided and with more than one wick
Answer
Preferably, one should use a torch, i.e. a multi-wicked candle so that a significant amount of light is produced.
A torch is defined by Jewish Law as a flame that is produced by the joining of two or more wicks. As such, one does not necessarily need a special Havdalah candle to fulfill his/her obligation. One can place two single-wicked candles together or even two matches together so that they form a single flame.
All the best!