"Elm" has two meanings, respectively:

1, elm, deciduous trees, leaves ovate, flowers with short peduncle, the wood can be used for building or making instruments, furniture and so on.

Cited explanation:

Elm pod: the fruit of the elm tree.

Elm money: elm pods, round and small in shape, like small copper coins.

Elm leaves: leaves of the elm tree, young leaves can be eaten and used as medicine.

Elm whip: elm tree branches used to steer the horse.

Elm yoke: an ancient torture instrument. The yoke is made of elm wood.

2. Surname, (Yú) surname.

Cited explanation:

Yu calyx: the name of a good doctor at the time of the Yellow Emperor.

Yushan: the name of Xia Yu's father.

Expanded Information:

East is gone, Mulberry is not late

Explanation: The word "EAST" refers to the place where the sun rises, indicating the early years. "Sanyu" refers to the place where the sun sets, indicating the later years. Though the early years are gone, it is not too late to cherish the years to come.

Source: Tang Dynasty, Wang Bo, "Preface to the Tengwang Pavilion": "Though the North Sea is on credit, it can be connected to the rock; the east corner has passed away, and it is not too late for the mulberry elm. Meng Chang is a noble man, but he has no intention of serving his country; Ruan Ji is a wild man, but he is not a poor man's cry."

Analysis: Although the North Sea is very far away, the palace of Ya Hao can be connected; although the morning has passed, it is not too late to cherish the dusk. Meng Changjun is noble in heart, but in vain he carries the passion to serve the country, Ruan Ji is indulgent and unrestrained, how can we learn his kind of poor cry? Lyric of the ancient literati, although encountered the "time of life of the poor", still because of the self-motivation of the bosom.