Iron Throne
The Iron Throne is the throne where the King of Westeros sits. It was created by melting the swords of defeated kings of Westeros in the dragon fire by Aegon Targaryen, a conqueror who managed to bring all the fighting lands of Westeros under one ruler. The throne represents ultimate power in Westeros as all the lords in Westeros follow one king. It is a symbol for the highest authority.
Dragon Cyvasse piece
When Arianne Martell is scaught conspiring against her father to crown Myrcella Baratheon as Queen of Westeros, she is put under house-arrest. She begins to grow impatient and angry with her father for not avenging Elia and Oberyn and for being a coward. But, Doran lets her on in his plans to overthrow Lannisters from power by supporting Daenrys’ claim, as he hands her a Dragon Cyvasse piece, and whispering Fire and Blood, signifying the Targaryen line.
House Sigils
Every house in Westeros has a Sigil, which is used as an identification among the houses. Throughout the novel, different sigils occur sometimes, for the basic purpose of identification or for foreshadowing. For example, the gravedigger petting the dog is taken by most readers as an indication that the gravedigger might be Sandor Clegane.
Songs
Songs in the A Song of Ice and Fire universe are a very common motif and are often used for forecasting. Songs like the Rains of Castamere are often used by Lannisters to threaten those who provoke them.
Needle
Arya’s sword acts as a symbol for her identity. While training to be an assassin with the Faceless men, she finds it difficult to leave her identity of Arya Stark of Winterfell. She faces an identity crisis as she shuffles between different identities. Needle, for her, is one thing that keeps her rooted to her original identity.