The Ubanu'hi (infinity symbol) is a kind of guilloche or interlaced strapwork motif that can be angular or rounded. It was used by Edo artists in the decoration of many Emwin Arhe (royal treasures) and is ubiquitous in Benin royal arts. Ubanu'hi is a shortened form of “uba no Ọba ya de agbon ke ehimwin yi”, which means “the rope with which the Ọba ties the heaven and earth together” (pers. comm. Chief John Igbineweka Inneh n’Igbesawman, 2022). Similarly, Paula Ben-Amos Girshick (in Plankensteiner 2007, pp. 339, 341) described this as “Ọba n’iri agbon”, or the “rope of the world” pattern.

According to Ọbabanmu Ineh (in Blackmun 1984, p. 51), the use of this motif indicates that objects were carved by members of the Igbesanmwan. However, the motif is found on all types of Emwin Arhe (royal treasures), not only those made of ivory or wood. On the flanges of the Ama (relief plaques) alone, Kathryn Gunsch (2018, pp. 75–77) identified three different versions of the Ubanu'hi and, through her analysis of over 850 plaques, found that these different Ubanu'hi forms align with other characteristics, such as dimensions, the prevalence of ornamental motifs, and stylistic qualities. Together, these provide evidence, she argues, of different production groups among the plaque makers .

Kate Ezra (1992, pp. 209, 264) went on to argue that the use of these motifs indicates that certain objects were used in a “royal context” and were associated with “royal patronage”.

Ikharo are linear keloid markings depicted on the forehead of Uhunmwu-Elao (commemorative heads) in groups of three or four above each eye. The exact meaning of Ikharo is debated; some have argued that they relate to the gender or tribal identification of the person on whom they are depicted. For example, has argued that they were worn only by men; however, their use in depictions is not consistent with this, and the Iy’Ọba are also shown wearing them. argued that they are instead a stylistic feature employed by artists that varied over time.

The naming of these markings differs between publications. For example, describe these markings as “agbaguda n'ehae”, which they write translates literally as “blades of the forehead”. However, later went on to call these “ikharo”, as used here. referred to these forehead markings as ikharo, meaning “tribal mark [of eye]”.

Ikan Aro are two linear markings in the centre of the forehead, located in between the eyes. These are usually inset with iron on depictions otherwise made of brass, bronze, ivory or wood.The use of iron was significant due the association of this metal with Ogun, who is god of iron and metal. These markings appear on both men and women, however are a common feature of representations of Iy'Oba Idia. Flora Kaplan (1993, 59) argued these are not tattoos, unlike the Ikharo. According to Nevadomsky (1986, 42), these incisions "signify determination, firmness, resolve, or even maturity". Kaplan (1993, 59) has also made a link between these markings and oral history told to her by Oba Erediauwa describing the events leading up to Idia (before she was Iy’Ọba) becoming the wife of Ọba Ozolua, whereby her parents tried to disfigure her to “repel” the Ọba. According to this history, the Ọba “sensing something was wrong”, called his doctors to intervene and treat her quickly, and as so she still became his wife.