What words are usually engraved on old Japanese axes

There are a number of words that are engraved on traditional Japanese axes, including the following:

Maker's name or trademark: Some traditional Japanese axe makers will have their name or trademark engraved on the axe head to show their maker's identity and guarantee of quality.

Symbolic characters or motifs: In addition to the maker's name, the axe head may be engraved with symbolic characters or motifs such as kendo, kinkubo, or mokume. These names and motifs have certain symbolic meanings in Japanese culture; for example, Kendo represents the spirit of the samurai and the traditional skills of the katana, Kinkubo may be the name of a place or person, and no inscription indicates that there is no clear identification or marking of this axe.