On Mantra WU and retropsection

I would like to ask for the mantra WU an instructor said it helps to probe the subconscious while meditating
is it that we should be saying the mantra WU while meditating and what's the importance of the mantra WU for meditation
is it similar to mantra RAOM GAOM or it's different in a way
(-)And is it ideal to say mantra while meditating since i experimented wth it and saw it really helps dramamtically