Legg is a German word meaning "law". In German law, Legg refers to a lawyer's legal certificate (perhaps it can be understood as a license), which proves that a lawyer is qualified to practice. Legg is very important to the German legal system, because only lawyers who have undergone professional training and examination can get it.

In addition, Legge has another meaning, referring to a law publishing house founded by the German jurist Eugen Lehmann. Established at the end of 19, this publishing house has been devoted to publishing legal books and documents. Legge Publishing House is still active in German and European law circles, and it is one of the most influential law publishing houses in Germany.

Finally, Jacob can combine with two other phrases to form the phrase "Lyman Theorem". Leger theorem is a tool to solve combinatorial mathematics problems, which is mainly used in the field of graph theory in discrete mathematics. German mathematician Eugen Legg discovered Legg theorem. It is very useful in solving some simple and complex graph theory problems, so it is also widely used in computer science and information engineering.