Sensei is the Japanese word for a teacher and Sifu is the Japanese word for a grandmaster.
While Brazilian Jiu-Jitsu does not come from Japan, it is based on a Japanese martial art called Judo.
Any instructors who ask to be called sensei or sifu are likely to have this connection in mind when they tell their students to use these honorifics.
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A Judo instructor is called a sensei. Sir or Mister are also appropriate. Show respect!
Jiu Jitsu is a Brazilian type of Martial Arts. The proper name is Sifu, I would know I take jiu jitsu