It's not a sun disc - which is depicted in hieroglyphic inscription as a circumpunct (a circle with a dot in) and which is pronounced Ra - the glyph in the relieving chamber cartouche is a circular glyph with three horizontal strokes that is pronounced 'ch' as in the Scottish word 'loch'.
The inscription in the cartouche is 'ch w f w' which we pronounce as Khufu.
Not sure about flamingoes, despite the fact they are native to Africa. The AEs did not use the flamingo in their hieroglyphic inscriptions though they did use ducks, quail, vultures, various ibis, geese, owls, plover, cormorants, sparrows, swallows and jabiru.
The quail is the single consonant glyph for 'w'.