The letters "MFG" are typically used as an abbreviation for manufacturing. This is the most common meaning of the abbreviation, although there are alternate possibilities.
In the realm of science, for instance, "MFG" may stand for Molecular Frequency Generator or Major Functional Group. Investors may know MFG as Magellan Financial Group, and "Mit Freundlichen Grüßen" is a German greeting sometimes abbreviated MFG. However, it is far more likely to find instances of MFG used in place of the word manufacturing. When using the abbreviation as part of a proper noun, such as Tritan Mfg. Group, only the first letter should be capitalized, and a period should be placed after the last letter.