Overall an escutcheon Argent with an evergreen oak Vert trunked.The shield is quartered, depicting in the first quarter the rampant lion of the Kingdom of León (with the field Or instead Argent); in the second, the castle of the Kingdom of Castile; in the third the columns represent the Pillars of Hercules, adopted as badge by King Charles I; and in the escutcheon is displayed the most common tree in the region.

[2] Almost the entire territory of Extremadura was conquered by Ferdinand II and Alfonso IX of León and the royal arms were introduced in the seal of the Badajoz.

Later Extremadura was part of the Crown of Castile and the Pillars of Hercules with the motto were granted to the city during the reign of Charles I.

This author, offered a correct heraldic description and reminded that the first quarter should be Argent, the official design of the castle is similar to a tower and the crown should have eight arches (five visible), orb and cross.

[3] The correct blazon proposed by Pedro Cordero Alvarado is:[3] Per fess and in chief per pale Or a Lion rampant Gules, and Gules a triple-towered castle Or masoned Sable and ajoure Azure; in base Azure a ribbon Argent charged with the Motto 'Plus Ultra' written Gules, the ribbon accosted and conjoined two corinthian columns Or; wavy champagne of eight Argent and Azure; overall an escutcheon Argent, an evergreen oak Vert.