Whenever Ibn Umar greeted Ibn Jafar, he would say, "Peace be upon you, son of the one with two wings."
كان ابن عمر اذا حيا ابن جعفر قال: السلام عليك يا ابن ذي الجناحين.
Bukhari narrated it in Maghazi (4264), from Muhammad bin Abu Bakr, who said, we were told by Umar bin Ali, from Ismail bin Abu Khalid, from Amir, who said, Ibn Umar was... and he related it.