師傅, 師父 or 师傅, 师父 while there is a minor nuance between Shīfù and Sifu, but both are used interchangeably.
Sifu is often translated as teacher in reference to martial arts instructors; however, it refers to a skilled person who may teach, but SiFu actually means master of. 八字 BāZì combined with 师傅 SiFu means the eight-character master or someone who has mastered the eight-character system. Occasionally, BāZì Sifus are also known as Ying Yang Master; calling these scholars solely Sifu seems to be sufficient.
The BāZì Sifu domain name doesn’t refer to me as the author of this domain content but rather to a system/calculator who assists BāZì Sifus/Ying Yang Masters, also called practitioners.
The traditional/manual way to plot an eight-character chart for non-astronomers required either counting the palm/fingers method or using the Xia/Ten thousand-year calendar as a reference. Both methods are not only prone to errors but also quite cumbersome; therefore, a precise calculator that automates the deciphering and interpretation process can be truly considered a BāZì Sifus assistant.